It's safe to say OSU and MSU won't both be in the Final Four since they will have already met in the regular season -- whoever loses that game will (for all intents and purposes) be out of the playoff.
http://www.tournamentofroses.com/rose-bowl
"The 102nd Rose Bowl Game will be held on January 1, 2016 at the Rose Bowl Stadium.
The game will feature the champion of the Pac-12 and Big Ten Conference.
If the Conference champion is selected to participate in the College Football Playoff Semifinal, the Rose Bowl Game will select the next best team in the conference.
The Rose Bowl Game will host a College Football Playoff Semifinal in 2018."
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