Now that we know Oregon is going to the Rose Bowl, the rest of the Pac 12 bowl slots should be pretty easy to figure out. If Utah gets an at-large bid to the Cotton Bowl, then USC goes to the Alamo, Washington to the Holiday, Cal to the RedBox, Arizona State to the Sun, and Wazzu to the Las Vegas. The Pac 12 won't be able to fill their slot in the Cheez-It Bowl.
If Utah doesn't get the at large bid then they go to the Alamo and USC goes to the Holiday. I've heard rumors that the RedBox is going to take Cal regardless, which would drop Washington the Sun, Arizona State to the Las Vegas, and Wazzu to the Cheez-It.