It shows us Jehovah God's promise for the future. No more tears, suffering, or death is among the many promises that Jehovah God has laid our for us. Also John 5:28,29 tells us that those "in the memorial tombs wil hear his voice and come out", and this is a future we can definitely look forward to.
It is the garden of Eden revisited, when God does away with this sin cursed world, and we are able to walk and live with God literally(Heaven) afterall Heaven is being with our Savior Christ. We can see from this passage that there are intially tears in heaven shed, maybe from a loss of rewards(1 Cor 3:12-15) The important thing is if we are a child of God, no matter what the tears are from, God will wipe them all away, there will be no more suffering of any kind. 1Cor 2:8-No eye has seen,no ear has heard,no mind has conceived what God has prepared for those who love him