It's unlikely that the SEC will get 11 teams eligible - this would probably require Miss. State to win out against Arkansas and a solid Mississippi. Thus SEC probably won't have a 'leftover' team to compete with any Big 12 leftover team.
I don't know how the BCS standings will look tomorrow but with a bad USC loss and LSU unable to get a 3rd SEC bid, it still seems quite possible for Iowa to get a BCS bid and open up another bowl spot from an unfilled Big 10 tie-in.
Hope KSU and KU lose out.
All that I'm worried about right now is beating Missouri. Anything else is counting chickens.
I don't see why anyone thinks the Big 10 won't get 2 teams in the BCS. They chose a 3 loss Illinois team a few years ago so that they could get their classic match up in the Rose. I don't believe it has as much to do with actual TV ratings as people think.