Miz:
My understanding is that the "new earth" (Isa. 65:17;66:22; 2Pet. 3:13; Rev. 21:1) refers to the time after Christ reigns for a thousand years during the millennium. During that, Christ reigns in righteousness over the earth, but very few details are given.
There certainly is alot of speculation about the millennial earth, but not Bible based.
2cor.12:2 Pauls talks about being "caught up to the third heaven". Verse 4 he says "he was caught up into paradise" sounds like heaven and paradise are the same place.
Rev 2:7 "To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God."
Rev 22 a picture of heaven is given and the tree of life is mentioned three times, v. 2,14,19 shows that paradise is synonymous with heaven.
Jw's clearly teach that after Armageddon,(living Jws, btw. never paid for sin) they are the ones responsible for turning the ruined earth into a paradise, not just for themsleves but for billions past, to give them a "second chance."
Hebrews 9:27 "and it is appointed unto men once to die...." If there were a second chance and people failed that test, they would have died twice? hmmm