It's all riding on Clemson, Washington, and Alabama at this point. Any of the teams losing would open the door for something crazy, depending on how the B1G championship game goes.
Assuming all 3 of the above win...
If Penn State beats Wisconsin, Penn State is in as they have the head to head over Ohio State. If Wisconsin beats Penn State, things get interesting, I could see Ohio State slipping into the playoff game and Wisconsin sitting at home. Wisconsin lost to both Michigan and Ohio State by a TD.
It all hinges on Clemson, Washington, and Alabama to keep things from getting crazy. They have to win.
Via the CFB Playoff
website. I'm gonna laugh hard if Ohio State is sitting at home again during the playoffs.