Well, I guess I'll throw my two cents in. I was there at Celebration and got to see what I'm guessing was a sneak peek at what's going to be coming out on bluray. Every night they would play two films back to back. I wasn't able to attend most of them because the shuttles stopped before the first film would finish. However, on one day because they were throwing a big party they moved the films up so I was able to catch a good chunk of ANH.

They had a big fancy digital projector hooked up that projected to a huge screen. Sorry I can't get into the technical side of things that's not my forte. Anyway, the film looked amazing. It looks like they might have gone and fixed the errors that the DVD release introduced as Luke's lightsaber was actually white again. The colors overall looked a lot better than what I remember of the DVD transfer.