The obvious answer for a physical re-release of Episodes IV-VI is 2027 for the 50th anniversary of Star Wars.
I wouldn’t bet substantial money on the unaltered cuts being included, but it’s the most likely scenario in the near future they’d be released.
This will be a massive box set of all Star Wars movies and spin offs; possibly including some television shows. The Holiday Special is a given to be excluded.
In terms of 8K resolution, I only have lay knowledge but my understanding is 35mm film is native 4K.
8K only brings out more detail on movies shot on 70mm film. Maybe 8K will be a thing by then but again, I don’t know how much more detail there is in the negatives to be extracted that a 4K scan would miss.
It’s worth noting even if the original versions are released and the restoration is indeed gracious, clean, sharp, with natural grain and 5.1 audio mix - the efforts by Team Negative 1 are still priceless. As noted, Star Wars wasn’t a clean and grainless movie. The 4KXX projects help preserve how they originally were.