Also wanted to mention that I'm not certain the "New Earth" will be considered part of the "New Heaven," as I believe the New Jerusalem will be, because They (Father and Son) and Their thrones will be there also (Rev 21:22, 23; 22:1, 3). There's no mention of anyone going from these Places (new heaven and earth) to the New Earth after the Millennium.
There is a mention of possibly its inhabitants going from there (new Earth) to those Places (21:24, 26), of which I am still researching; and I like John Gill's commentary the best so far but still ironing many wrinkles in my conception of this:
http://www.ewordtoday.com/comments/revelation/gill/revelation21.htm
I strongly suspect that Israelites will be saved during the Millennium and these will inherit the New Earth, and I've been researching this one for a couple years now.
As the New Heaven and New Earth are created AFTER the millennium, I'm not sure what you are seeing here NC?
Personally I find Gill to be a little to old fashioned in his 18th century views.
I'm also not understanding how you can think the New Jerusalem will be part of the New Heaven?
Doesn't Rev 21 show the order?
New Heaven and New Earth created AFTER the 1000 year reign in v1.
New Jerusalem comes down from the New Heaven onto the New Earth in v2 & 10.