It's a foregone conclusion that they have to win next week in Indy. So that said, if they win they're in. The winner of the B1G title game is in. Period.
ESPN is touting chaos but I don't think so. Washington is not in, even if they win next weekend in the Pac12 title game. Their schedule doesn't warrant it. They don't have a signature win, and until they beat WSU Friday, they didn't have a win against a ranked opponent.
Really, OSU is already in. Their win today sealed it. There's no way the committee leaves them out- they're the only team in the country that has a chance to challenge 'Bama.
That leaves 1 spot- and Clemson gets it if they will the ACC title game. The committee will want the marquee star factor in there.
If Clemson loses it probably opens the door for Washington if they beat Colorado. I'm guessing the committee will only want one 2 loss team, which coming from the B1G that's ok as they're the best conference this year. If Colorado beats Washington, then there will have to be 2 two loss teams. Then it gets really messy.
Im guessing it'll be 'Bama, OSU, B1G champ, and Clemson.