I would bet money on the fact that this is the only OOT release on DVD, and possiblly hi-def. He won't put the OOT in the 30th anniversary set because that would bring down his overall "vision." His reasoning will be that for the 30th anniversary he had to make the films "perfect" and because of that the OOT can't be present. Also, its the perfect "Fuck You" to the OOT to not include it in the set that celbrates its 30th anniversary. It's like having a birthday part for someone without allowing them to come, which is exactly how Lucas treats the OOT. He did this release a few months before the archival set so that he could throw a bone to the OOT fans before the big set comes out. The release date of the OOT DVD alone is proof he won't be releasing it with the 30th anniversary.