I don't see any reason to assume they've been cancelled. I always thought they were more suited to October amyway.

MGM/Fox will be quite aware that the Corman and Price sets are not likely to be big sellers as most people interested in those titles will already have them. Essentially this is just a cheap repackage/reprice deal to snag all those people that didn't buy the original releases because of all the nonsense about Best Buy and things going in and out of print.

They will want a new batch for new sales.

It is also quite possible that Fox and MGM don't want to release a glut of similar titles all in one month. September is pretty heavil loaded already.