There’s relatively little for the various commentators to differ on in these chapters.
There are the usual questions about literal vs symbolic (is the new Jerusalem an actual city or symbolic language for the people of God? – and so on). There are questions about whether the earth will be destroyed and replaced, or renewed in some way. Will the whole cosmos be replaced, or just our bit?
But, in the end, there is a general longing to experience it all, a yearning to be part of it. The vision of the end is simply sensational.
I’ll be preaching through Revelation in 2015 and I can’t wait. Unless, of course, the Lord returns..!