I think there are both ACC and B12 teams that have the flexibility and SOS desire to add BYU. I think games could get scheduled. But it also wouldn't surprise me to see the ACC go conference only and the B12 teams all take the easiest route on scheduling, whatever that route might be for each school.
It also wouldn't surprise me if, thinking about the Hawaii situation that somebody recently pointed out, BYU does a 1 year sojourn in the MWC.
Going AAC heavy with replacement games, plus picking up some more MWC opponents seems the most likely. As far as announcements, I expect they will start to trickle out with a full 10 game schedule announced by the end of next week.