I wouldn't put too much stock into it. The cover for the main holding box, plus the cover for the 1961-1985 volume, plus one of 15 promotional posters for the release, promotes 1977's Star Wars with a picture of Vader from the ROTS publicity shoot.

Although I will admit, it is unusual that in the trailer they seem to have selected the shot as it appears in the material seen on the 1997 SW doc. Surely it would have been easier to simply use the 2004 DVD itself if that is what the set contains? But that video also shows a clip from Alien 3--which isn't even on the set! So I wouldn't put too much stock into it until someone can confirm it. I doubt this contains any new material or transfers. It looks like they just used clips from 1997 promotional ads. There are other scenes from films like ROTJ--which, again, isn't even on the set--and not only does the colouring correspond to promotional material from 1997 (to my eyes at least), but you can also see videotape artifacts that the other clips from the films don't have (watch the hyperspace shot, with its rainbow moire), so they probably just used some sort of 1997 promotional materials master tape rather than the DVDs themselves. That's how I would explain it, anyway. Why, I don't know. Maybe they don't have the 2004 DVDs on hand because Fox has been relegated to a mere distributor today whereas in 1997 they were the main agent behind the release and not Lucasfilm and hence have all of that material on-site.