"And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them. They will be his people, and God himself will be with them and be their God. ‘He will wipe every tear from their eyes. There will be no more death or mourning or crying or pain, for the old order of things has passed away.”" Rev 21:3,4
Does this Bible passage refer to a time when God will restore a paradise earth  after armageddon like the Watchtower teaches? And if it does are Jehovah's Witnesses doing their part to do God's will before armageddon strikes?
Let's look at Rev 21:3,4 from the stand point of a Jehovah's Witness for a moment. Then we'll explore other interpretations of Revelations 12:3,4.
We know that God is love. All major religions teach this and it's a universal 'truth'. Jehovah's Witnesses believe God is love as well.
Since God is love and Revelations says 'they will be his people and God himself will be with them and be their God', it could mean that God's people will practice love and 'love' will be their God. Makes sense doesn't it?
As a result, (because of love) God and God's intense love for all the people he created, people are no longer afraid of death. They believe God loves them so much that they don't die when their physical body dies. They no longer fear death. They believe in life after living life as a human. Jehovah's Witnesses believe in a 'resurrection'. Therefore there's no need to fear death because people don't die, - just their human body dies. Thus God 'will wipe every tear from their eyes'. In this 'new heaven and new earth', there is no more 'mourning or crying or pain'. As a human, emotional pain does not exist because people love each other. There are no more tears.
Jehovah's Witnesses believe that in this paradise earth, death will be no more. They will live forever on the earth at the prime of their life, have children, and never die. The problem with this interpretation of the Bible is that if no one dies, everyone is in their prime, and everyone is having children, how long would it take for the earth to be overpopulated and unable to sustain life?
Since JW's also believe that parts of the Bible are meant to be interpreted symbolically, the words 'there will be no more death' probably should be interpreted symbolically as well. 
Likely, Revelations 21: 3, 4 does not refer to a paradise earth where people live forever, never die, and have children eternally. It could refer to a time when people will love each other without regard for their neighbors opinions or religious beliefs. Humans still die like they always have, but there is no fear of death. Because there is only love, there are no more tears, mourning, or emotional pain. That's one possible explanation.
No more death may also refer to a peaceful world where people do not wage war against each other and people don't murder each other. [6a] [6b]
Another possible interpretation of Revelations 21:1-4 is that when our body dies, our soul continues to live. Therefore there could be a 'new heaven and a new earth' with 'no sea', meaning that a person no longer has the physical requirements that a human body has. They have been transformed into an immortal, spiritual being. They can now live without 'the sea' [Rev 21:1], there's no more death, tears, mourning, or pain, the former things have passed away. i.e. they are free of the constraints of their physical body, they realize death is an illusion, they're still alive, and death is nothing for humans to fear.  
Jehovah's Witnesses don't believe in hell because they don't believe the soul leaves the body after death. They believe they'll be 'resurrected' sometime in the future and given a perfect body. In other words they die forever no matter what kind of life they led. This means the person that will be resurrected won't be them! It will be a clone or a new person with all the same memories.
While many will disagree, heaven and hell can be created on earth and in heaven depending upon how much we love ourselves and our neighbors.
Regardless if one is a human or departed spirit, love brings us to emotional 'heaven' where there is peace, contentment, freedom, and 'paradise' if you want to use a Watchtower term. Lack of love brings us to hell, - the place where 'Satan' and evil resides.  Hell is the opposite of heaven, just like love is the opposite of hate. Hatred and judgment causes people harm others physically and/or emotionally. Jehovah's Witnesses would call this behavior 'wickedness' or 'evil' or 'Satan's world'.
Ironically even though the Watchtower teaches that Jehovah will wipe out the wicked at armageddon because they cause death, mourning, tears, and pain, Jehovah's Witnesses themselves are responsible for causing 'death' (a complete cutting off of relatives and friends forever), Ending relationships with children, parents, grandparents and other close loved ones, causes much mourning, grieving, tears, and pain. Some people who are shunned turn to drugs and alcohol to numb the pain. Others have committed suicide.
Is hell real? Is there a hell? Consider this. Have you ever been emotionally tormented as a human? What was the cause? Did you love yourself and others at that time? Did you feel loved? Probably not. That's what caused your 'hell'. After death, what's going to change? If you lacked love in the human form, will you magically become loving when you depart your body? Maybe you will when you realize who you really are and how much God loves you in spite of all the mistakes you made.
But what if you're a Jehovah's Witness and die? What if you shunned your loved ones while being a human? Now if you discover you were wrong about death, it would be incredibly difficult to communicate with the people you hurt and tell them how sorry you are. Why? Because no one in your family and none of your friends believes in life after death! They don't believe you're alive and well! They're not listening because they believe it's impossible for you to communicate with them. They believe you're dead. They don't believe you've transitioned to spirit form. They don't believe you're trying to communicate telepathically with them so they can't hear your words and how sorry you are for all the pain you inflicted upon them. Is it possible that you could find yourself in hell, - eternally tormented with fire? Maybe. No one has all the answers but if there is a hell, lack of love when you lived on earth might be the cause of torment forever. Perhaps that's why many believe that if you intentionally harm people while being human, you will go to hell.
The word 'paradise' occurs only 3 times in the Bible, but it occurs thousands of times in Watchtower literature. Why is that? Jehovah's Witnesses say 'everything' they teach is in the Bible. However the paradise earth story is no where to be found in any Bible.
When we look at the Watchtower's paradise earth story, we see that Jehovah's Witnesses are not doing what it takes to make a 'paradise earth' possible. They are not champions of of freedom, peace, love, and paradise at all! They are hypocrites. That's not a judgment. It's a fact. There's just no kinder word that expresses the truth about the Watchtower Society.
Jehovah's Witnesses have not tried to create an environment where there is no death, tears, mourning, or crying. Jesus said 'by their fruit' you will recognize who they really are. Matthew 7. The Watchtower is producing 'bad fruit'. i.e. they publicly pretend to be doing God's will but in private they are doing just the opposite. Here are the facts about the Watchtower and Jehovah's Witnesses.
Jehovah's Witnesses love each other like the Bible teaches but they don't love everyone. They don't love their 'enemies' like the Bible teaches, and they definitely won't have anything to do with relatives and friends who leave the Watchtower.
The Watchtower has destroyed millions of loving relationships and families since 1952 when they established their shunning policy.  Many haven't spoken with their former loved ones for decades. They have treated their loved ones as if they are literally dead. Most go their graves without making contact with parents, children, grandchildren, brothers, sisters, cousins, aunts, uncles, friends, ... Has the Watchtower shunning requirement caused some mourning, tears, crying, and pain? You bet it has.
If we keep doing what we've always done, we'll keep getting what we've always gotten. Change is necessary but change is never easy. There's hope for Jehovah's Witnesses but they need to turn their monster religion around. It has caused way too many tears, mourning, and pain since 1952 when the practice of shunning began. The only other option for Jehovah's Witnesses is to examine the facts about Watchtower and leave.
Since JW's believe armageddon is 'right around the corner' and they must be loyal to Jehovah, Jehovah's Witnesses must stop shunning relatives and friends. They need to live their lives in harmony with what they believe. If they believe Jehovah will restore a paradise earth, that's cool, but don't do things today that Jehovah would never tolerate on a paradise earth.
Jehovah's Witnesses believe armageddon will strike at any moment and they must obey all of Jehovah's commandments to be saved. They believe that if Jehovah judges them and if they don't survive, they will die forever with no hope of a resurrection.
What will Jehovah say to Jehovah's Witnesses who have shunned relatives and treated them as if they are dead? How will Jehovah judge Jehovah's Witnesses who have caused loved ones a life time of mourning, tears, crying, and pain?
There is hope for Jehovah's Witnesses who are willing to make changes and do what it takes to align themselves with God's love. The Bible makes it clear that we must love everyone to inherit eternal life. It says, “narrow is the gate and cramped the road leading off into life, and few are the ones finding it.” Matthew 7:14.
1. Watchtower shunning policy
2. Watchtower 'disfellowshipping' and shunning began in 1952 to keep immoral people out of 'God's organization'. Later it became a tool to silence and intimidate anyone who questioned the organizations rules. By 1981 it became a serious sin to resign and leave the Watchtower Society. As of today, July 27, 2014, shunning is still required. In fact the Watchtower has ramped up it's efforts to enforce the practice in recent years.
3. The origins of 'Satan' and evil began with angel leaving God and God's love. See Satan
4. Problems with the Watchtower's Paradise Earth promise such as the fact that it's not in the Bible!
5. In the JW faith loved ones, relatives, and friends die all the time, even though they are physically very much alive. Could that be what Revelations 21 is talking about? The Watchtower requires Jehovah's Witnesses shun everyone who disagrees with Watchtower teachings. There can be no contacted. Anyone who leaves the Watchtower is to be treated as if they are dead. This causes people inside and outside the organization to mourn the loss of loved ones. It causes many tears, crying, and pain.
To make matters worse, shunning is a requirement.  It's not a matter of conscience. The Watchtower refers to shunning as 'God's command'.  Absolutely no serious questioning of Watchtower statements is allowed. See Shepherd the Flock of God for Watchtower rules and punishments for not being 100% loyal.
Even though most religions don't require shunning like the Watchtower does,  it's pretty common for people today to break off contact with friends and even family, when there is a strong difference of opinion or personal conflicts. The cause of these conflicts is a lack of love. A situation similar to 'death' happens when people choose to distance themselves, not speak to each other, and have no contact. The result of 'death' is 'tears, mourning, crying, and pain'.
Love doesn't mean people agree with each other on everything. It means that they are kind and compassionate to each other regardless of beliefs. They agree to disagree. Since God created us (Adam and Eve) to be free, it's logical to assume God doesn't require us to have the same beliefs. All he asks is for us to love. This is what Jesus, Buddha, and all the great spiritual teachers encouraged.
6a. Revelations 21:3,4 may refer to a time when people will love each other without regard for their neighbors opinions or religious beliefs. Humans still die like they always have, but there is no fear of death. Because there is only love, there are no more tears, mourning, or emotional pain. That's one possible explanation.
No more death may also refer to a peaceful world where people do not wage war against each other and people don't murder each other. 
6b. Revelations is filled with symbolism and riddles. It can be interpreted in many different ways. Even though Jehovah's Witnesses say they don't interpret the Bible, what they really mean is they believe in only one interpretation out of many possible interpretations.
e.g. if we take Revelations 21 literally to mean that Jehovah will create a paradise earth, why does the same chapter say, 'and there was no longer any sea'? Rev 21:1. Does that mean there's no more water on the planet? And if so, how is human life possible without water?
7. The pain cannot refer to physical pain because we as humans rely on pain to warn us of potential harm. Pain in the physical form is necessary to prevent injury. The belief that accidents will never happen, people will never cut themselves, or catch a disease is absurd. This would require humans to have absolutely no sensory capabilities. We'd be completely numb to physical pain and our bodies would feel nothing pleasurable or painful.
8. Jehovah's Witnesses don't believe in an after life but most people do. When you believe people go to heaven or leave their body and become a spirit, then there's no need to fear death because the act of dying is merely a transition to a better place.
Heaven is the place where God lives. In this place there is love. Where there is love there is no tears, mourning, pain, or crying. When you have this belief, peace on earth and in heaven takes on new meaning. There is no mourning over death. There is rejoicing. Death of our physical body is likely not the end. It's a beginning. It's a place to which we are all going regardless of our beliefs.