Best case scenario (for me):
(HARP MUSIC PLAYS....)
Lucas finally realizes that he's gone to the well once too often and he will need to release the OOT to get some additional $$$ from the more discerning, old-school fans.
He will magically discover a useable print of each OOT film, and a 2k or 4k scan will be done. No major cleanup will be done, perhaps just some color correction and minor scratch removal. The soundtracks will be straight of the prints- no remastering or major cleanup done on those either.
He will release the SEs (of course) on blu-ray, each film will be a 2-disc set. Disc 1 will be the SE of each film, disc 2 of each film will be the OT version.
They'll be extras included, probably split between disc 1 and disc 2. Probably the same stuff that was on the bonus disc of the '04 DVD set. As an extra bonus, deleted scenes from all 3 films will be included, as well as some of the trailers that were not included in the DVD set.
Personally, that's all I want, and I probably won't even get that. But I will always hold out hope.