As many have already said, I'd like to see:
1. The original theatrical versions of all six films, preserved exactly as they were when they premiered. I'd expect the picture to be cleaned up, of course (by an outfit that actually cares about what they're doing), and the original audio preserved, and presented in anamorphic widescreen.
2. Whatever "special edition" versions of all six films he'd care to present. I really don't care, because fan editors (such as Adywan) will undoubtedly take great pains to adjust any mistakes and/or stupid decisions.
3. Whatever extras he'd like to include, but on one or more discs completely separate from the films. Each film on its own disc, taking as much "bandwidth" as possible to maximize picture quality, and the extras on the side (including Easter Eggs).
4. DVD and Blu-ray releases. Despite the opinion of many people, DVD ain't dead, not by a long shot. :-)
Something like that would satisfy most people, I think, plus it would also allow him to present his Grand Vision as he sees it. I'd be happy with that.