What seems most likely to me:
West Virginia to ACC - would allow them to revive the Backyard Brawl with Pitt, also close proximity to Virginia and Virginia Tech. It would not shock me if the ACC were to add Houston, too.
Kansas and Iowa State to the B1G - Kansas for sure, Iowa State maybe. Both schools are AAU members, which the B1G really likes. Kansas is extremely attractive for hoops, and probably no worse at football than Illinois. (Which is to say, they're terrible.) Iowa State has a longstanding rivalry with Iowa, and would fit in well regionally with Nebraska and Minnesota as well.
Texas Tech and Oklahoma State to the Pac - Pac will need to expand to keep up with the Joneses. These are probably the two best remaining programs in the Big XII, and these schools would fit in reasonably well with Colorado, Utah, and the Arizona schools. I could see the Pac also entertaining the idea of adding Boise State and maybe BYU (if the Pac decides to get past the whole Mormon thing) to get to 16 teams. Oklahoma State to the B1G is also a possibility, although that seems like less of a good fit to me.
Baylor, TCU - probably the American. These are smaller programs that would probably thrive in that conference, although the loss in conference prestige would be a blow. When the CFP expands to 12 teams, I could see the American getting at least one bid.
Kansas State - who knows? My guess is they might join the Mountain West with the likes of Colorado State, Wyoming, Air Force, etc. unless the Pac gets desperate enough to add them.