That's that guess, yes. Or the person they have to "sub" it actually went to the theater and will be getting their BD copy about a month earlier that everyone else. We still would have to wait until the 25th or even October 10th, so something for one of those to come about. Otherwise, we wait until October 25th plus shipping time.
But they can be watched Raw, and about half to two thirds of it can be understood with series knowledge or just how things happen. I've found MBS can be watched online live as I've been watching the episodes as they air (1am Pacific time on Sunday).