We still don't think 4k versions will officially ever happen. But if you want to see some 4k frames scanned from Return of the Jedi, go here:
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http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/708913/#TopicPost708913
More here:
http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/709362/#TopicPost709362
http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/709581/#TopicPost709581
http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/709868/#TopicPost709868
http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/710020/#TopicPost710020
And finally:
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http://originaltrilogy.com/forum/topic.cfm/Team-Negative1-Return-of-the-Jedi-1983-35mm-Theatrical-Version-Release-Details-and-Updates/post/710162/#TopicPost710162
The vast majority of people don't currently have 4k moniters, or any way to play back media in that format. You could stream it at 4k, but you would need a lot of bandwidth to do it.
We'll see if we can post a 1-2 second clip in 4k to test it.
Team Negative1