ESPN.com should have a listing of how the bowls breakdown. Go to CFB, rankings, and along the top you'll see BCS.
Right now, it's all guesses.
In answer to your questions, the Rose will have a PAC vs B1G team. If Oregon ends up in the title game, it'll be a Rose Bowl decision. Stanford, maybe Oregon State representing the PAC.
Assuming Kansas State wins the Big12, they'll likely face ND.
Orange is going to have ACC vs Big Eastāprobably FSU vs Louisville IF Louisville beats Rutgers and Rutgers doesn't lose another game. FSU will need to win the ACCCG.
Sugar takes SECC plus an at-large.
So, bottom line, we'll see three at large bids: Rose, Fiesta, and Sugar.
All subject to change of course. A loss by Oregon in the PACCG they are out of the BCSNC, but in the Rose. That would probably put an undefeated Kansas State in the BCSNC pushing Oklahoma into the Fiesta.
A lot of football left to be played even though there are only three weeks left. A couple of losses here and there and this all gets shaken up.