Pretty hard to believe there will be any less than 7 in from the SEC and Big Ten the way it's set up and ND with that schedule will be in. So that leaves 3 spots for the big 12 and ACC champs then one other since #16 will be the highest ranked G5. Pretty much have to win the ACC or be that one team that's the lucky loser of the B12/ACC sweepstakes.
No matter what you think of the playoff (I clearly hate the concept) preseason rankings will still dictate who gets in at the end of the day.