I saw someone post this on hometheaterforums.com today. Not sure if this is completely accurate but I thought i'd post this here since it sounded interesting and has to do with the 4K restoration. I personally don't know what to believe because Wielage said that they wouldn't do a 4K release, but RMW did have on their website (not anymore) that they worked on 4K, so there's no way RMW would lie about that, which begs the question of when Mr. Wielage actually wrote this.
"I thought I would pass this information along.
Marc Wielage, who worked on the 2004 Star Wars masters, and has 35 years of video mastering experience within the industry (also having worked for Technicolor and Kodak), recently commented on AVS to my question of whether he had any knowledge of any 4K Star Wars work. I won't post the link as I am not sure if that is allowed here, but he replied to me.
To my knowledge, no -- it was all 2K. Note that Episodes 2 and 3 were all shot on HD with 2K visual effects, and none of the VFX in any of the Star Wars films were more than 2K. Some of the early digital stuff in the 1990s wasn't even HD.
It's an interesting thought as to whether they'd consider rescanning 100% of the live-action film footage in Star Wars and recomping all the VFX in 4K. That would be a monstrous expense -- I'm guessing as much as $20M -- so my gut feeling is it's not gonna happen.
People get very wrapped up in 4K, but I'm not convinced it's the be-all / end-all. I think 4K can look great, and I'm all for people shooting in this format, but the post process for 4K is so torturous and expensive, I'm not sure if the world is ready for it yet. I think it can work, but when you're looking at a project with upwards of 1200 visual effects, and each one takes 2 or 3 days to bounce around to different facilities (in 2K)... multiply that times 4 and tell me what it does to the schedule.
Having said that: there are more and more TV shows shooting in 4K. Sony showed some 4K demos of The Blacklistback in April at NAB, and I thought it looked fantastic. But that's not a show with 200 effects per episode."