The "demented wookiee" line will indeed be in this edit, kind of an easter egg for fans. I can see why it was cut, but it was fun to sneak it in there.
Luke's line in the Hoth battle "This is it!" just before the other guy gets shot has also been restored from the SE.
The SE/70mm versions of several music cues have been restored, as they are indeed much better. After Yoda's "That is why you fail," Leia et al chasing after Boba Fett and escaping from Cloud City, that kinda thing. Some of the Hoth battle is also from the 2004 discs, deferring to the fact that the dialogue was clearer.
99/100ths of the movie of course remains the 35mm soundtrack.
(For ANH, since you asked, the soundtrack was from the Definitive Collection TR47 PCM stereo, with some additional material from the mono mix, as heard on an old PAL TV airing. The opening and closing music was from the SE CD soundtrack to make it much clearer, something that I probably should have done here too for the Fox fanfare at least.)