There wouldn't be an UHD release of Star Wars unless there were a new remaster done, and that would be a whole new ball game. Either new color problems, more "nnnnnnNNNNNNNNNNOOOOOOOOOoooooooooo"s, (who knows what else), or even an original version release, since they'd have to go back to the source elements to make the UHD remaster in the first place and George has given up control (how much influence he still has over the property is what remains to be seen).
Granted, Disney hasn't been great about putting out faithful original versions of things (Lion King, etc.), but a lot of their changes are to mask questionable content, so who knows how they'd handle the situation Star Wars is in (and Fox still has rights to Episode 4, which is another matter).
Oh, one question I have, if Lucas only had a 1080p master done, to which he made all his changes, what was he planning to use for the 3D theatrical release? While I think the project has mostly been scrapped in favor of focusing on producing new movies, it still begs the question of whether he honestly intended to put out 1080p sourced footage to theaters... Wouldn't that look awful? And on that note, what kind of source did he use for the '97 theatrical release? Since it was before the remaster, did he just slap some CGI on top of old film prints, I don't even know how that would all work at the time... Did they scan it digitally at some resolution and add everything, then put it back on film at a quality worth projecting..... that was all done around '96, for reference Windows 95 had only recently come out... where did the CGI even come from? Heck, how does Jurassic Park even exist, that was what, made in '92 released in '93? Plotted on an Amiga Toaster and rendered on SGI Indigo running some form of Unix you say?... then Toy Story came out in '95 using a Linux render farm, and Linux had only started just 4 years before that release, which is amazing feat of development... *my brain is starting to hurt* And even further more, Attack of the Clones was the first SW to be filmed all digitally, so I wonder exactly what resolution he filmed that at (it is not like he had RED cameras available to him), therefore limiting its maximum potential quality as the TV producers get more and more ultra fantastically high definitionally gimmicky.... Wait, where was I going with this?