Weren’t the finalized scores for some of the prequels hastily chopped up in editing? If I recall, John Williams wrote a letter to Lucas expressing his displeasure at how his music had been chopped up in episode 1. The scores for the original trilogy probably don’t have this problem because the final cut was locked down before Williams started scoring, though some weird edits may still have been introduced from all the special edition tinkering. So given that this is an issue, I can’t imagine that they’d just use the current “film version” of those scores as the isolated score tracks. And going in to smooth out some of the choppiness seems like work…and we all know they won’t bother doing extra work for something like this.
So given the two possibilities that they’d either include the final film versions of the scores for all the movies or not include any at all, I predict it’ll be the latter. Letting us hear the isolated scores will just expose how they were edited from their original compositions. I personally wouldn’t mind it, but I can’t see them releasing something like that.
There was some chopping going on in basically every movie but the very first. Return of the Jedi is probably the most cut-up of the scores in the OT (although Empire had its own fair amount of flat-out deleted cues and tracked music), and a huge part of Attack of the Clones’ climax didn’t even have music written for it because I believe Lucas told Williams his intent was to track in Phantom Menace music for most of the Geonosis battle (and some of that tracking doesn’t sound great).
I don’t know that the “Williams sent Lucas a letter” story has any truth to it - it’s one of those “facts” that fans regularly trot out that never has a lot of linking back or validation to follow it up. I find it unlikely mostly because I can’t imagine Williams would have to write him a letter to voice his displeasure, or that if he was THAT displeased that he’d come back for future scores. Williams has no problem walking away from legendary scores if he doesn’t feel like it would be worth his time (Superman, Jaws, Jurassic Park, etc)
I can understand why people would choose to look at the isolated score as “this exposes the editing flaws” but I don’t see that as being their primary utility, nor would it really “expose” the fact the film was edited (there are much more clear, telltale signs of post-production shenanigans than music cuts). The fact is that even though there are obvious cuts and tracking going on in basically every movie to some degree (and some more than others) there are also TONS of cues that have never before seen an official release, and that music doesn’t exist anywhere else. I can’t imagine anyone’s primary concern at Disney re: isolated scores is “but if we release it this way they’ll KNOW WE EDITED THE MOVIE”
Yes, any isolated score wouldn’t be a PERFECT presentation of the unaltered music as Williams initially wrote it, but I also don’t NEED it to be for this. The option to toggle a score-only version of the movie while watching would probably be, for me, the best extra that hasn’t yet been made available for the OT/PT.