Here's how the division looks from here on out:
UCLA has the following remaining games: vs Colorado, @ USC. UCLA currently holds the tiebreaker over Arizona St....if UCLA wins out, they're the ones definitely in the the Pac 12 championship game
Arizona State has the following remaining games: vs Arizona, vs Cal. The Sun Devils have tiebreakers over the following teams: Utah......ASU needs to win out and have UCLA lose one more game (not that unlikely actually)
Utah has the following remaining games: @ Washington State, v Colorado. The Utes have a tiebreaker over the following teams: UCLA.....Utah needs to either 1) win out and have both UCLA AND ASU lose their respective remaining games OR 2) win out, ASU lose its last 2 games, and have UCLA lose 1 conference game
....I have no idea how three-way tiebreaker works for the Pac 12. However it is possible that - were Utah to win out and UCLA and ASU each to lose one more - there be a 3 way tie for the Pac 12 south championship spot