CE3K is a different story. The differences between the three versions are (mostly) editorial, which made it easy for them to branch all three onto the same disc.

For Star Wars, each version would need its own disc to properly do it justice. We would be insanely lucky to get three-disc versions for each of the OT movies ("current" version, '97, original), but let's just say it did happen. The lowry-restored (unless LFL decides to have that job completely redone) version would be on the first disc. The '97 version would be a on a second disc, mastered from the '97 IP. Finally, the original version would be on the third disc, mastered from its IP.

I wouldn't hold my breath for anything more than a two-disc set (not that many of us care about the most recent version) with the original theatrical version we've all been clamoring for.