From the 2 workprints we have, and a possible third one eventually. Along with a few replacement reels, we've mentioned that Return of the Jedi is already in very good condition, and will not take much of an effort to restore.
The cleanup is fairly simple, and wouldn't take much time. The color correction will take much longer, and that is what would hold things up.
Again, it's last on our list of priorities, and we're not planning a Grindhouse version since it's not in that condition anyways.
Eventually, a better version will come out, and we might highlight some scenes once Puggo's 16mm comes out.
As far as detail goes, maybe not every scene is up to the Blu-ray level, but most easily are. We have posted 4k screenshots in our thread, and other sample downscales which have plenty of detail in them, along with shots from replacement reels.
Team Negative1