They might’ve been a last minute thing since they couldn’t release what was originally intended for that time.
Maybe.
Hopefully the covers for the 4K OOT will reflect the original poster art and not the horrible steelbook cases. Though I would love a steelbook release to go with my TFA and eventual Rogue One blu-rays. This does leave Phantom Menace as a possible release later on, but Attack of the Clones and Revenge of the Sith will be forever stuck at 1080p and be even more disconnected from the good movies.