Dunedain said:

Is that the case with the stereo soundtracks for The Empire Strikes Back and Return of the Jedi, no music changes/additions?

It's my understanding that Hairy_Hen isn't doing stereo tracks for Empire and Jedi, just 5.1 tracks.

Dark_Jedi is, however, working on making the original 1980 and 1983 theatrical stereo tracks available to us (that is, synchronized to the GOUT DVD) for the first time, which is very exciting!

(Though to be fair, we don't know if the 1993 Jedi track is different from the 1983 track or not - we'll have to wait until DJ is done with his sync to know that for sure. Ditto with whether Empire or Jedi were remixed in 1985 or not.)