MagnoliaFan's looks once again to be the most extensive. I can't wait to see what he does with Qui-Gon; Jinn's my favorite Jedi and you have no idea how dissapointed I was by his absence in Episode 3, especially since he was SUPPOSED to be in it. But what's all this about Obi-Wan, ESB, and RotJ? Is it top-secret info for an OT re-edit? And how he handles Vader should be interesting to say the least.
Trooperman may have to re-think dubbing over Anakin in Episode 2 now; there's no way I'd want Hayden's performance erased in this one. It's going to be so great to see these drastically differenent takes on the prequels though.
My thoughts on Grevious:
He was a totally ridiculous, throw-away character, and IMO, the weakest part of the film. However, if things could be altered to make him Darth Maul, all would be forgiven. After much thought on the matter the best course of action would be to redub the three mentions of "Maul" by name in Episode 1 (all by Sidious) with "Grevious". He is now "Darth Grevious", and although I like "Maul" much better, "Grevious" is mentioned far too often to have things the other way around. Then Grevious can be re-dubbed in a Maul-esque voice, altering his lines to 1) Edit out the HORRIBLE villain cliche lines, and 2) Add references to him being Maul (defeated by Kenobi, waiting a long time for revenge, etc). There are still some serious logistics to be worked out on that, but I believe it is possible. How to tie in Sidious, Dooku, and Maul/Grevious all together for example, and Sidious' conversation w/Grevious will be quite a project. Another idea would be to make him Syfo-Dias, but I really have no suggestions on how to accomplish that.