Maybe I got something wrong but didn't Ady also announce an 1080p version once he switched from HDTV sources to the BluRay ?
Of course, if he keeps the source effects files, it wouldn't be too difficult to render them again for a 1080p Revisited? Right? Right ?! (Sorry, overly exited).
He started trying to do ESB:R in 1080 but a lack of processing power at the time and lack of high enough quality source material to use as patches/replacements for FX work forced him to scale back to 720. It's possible he could upsample back to 1080 but again it would depend on the quality of the source material.
As for my thoughts on PT:R, I think whatever Ady comes up with will ultimately be better than what we have. I've always felt that part of the reason the OT works is because Lucas was free to make up the story as he went along. With the PT, he had all these OT "history" points he had to fit in and it came out like he just had them all written down in a list and checked them off as he went along without really taking the time to figure out if and why "this" should happen before "that", how "A" affects "B", and so on. It's like he was running on autopilot just to get the films done after all these years so that people would stop asking him about them.
I haven't watched a lot of the Prequel edits but I can see where re-arranging events story-wise could have a positive effect on continuity, not just within the PT films but in carrying over that continuity to the OT.
Regarding making the entire Revisited project sync up with E7 and any future official SW, I'd say don't worry about it. This started out as a way to fix the SEs into what they should have been. Leave it at that and let others worry about how the new films work out. We don't know anything about E7 yet aside from the fact that it's coming. By the time Ady gets to real work on ROTJ:R, E7 news will start coming out and maybe changes won't be necessary.