I was driving home from Ft Myers today and Miller and Mouton had Jake Trotter on discussing the Big 12 expansion. I apologize that I don't know how to pull out the sound clip but if you follow the link and go to 24 minutes after 4pm, you can hear the segment.
He gives some really good reasons for why UCF is really the only good choice for the Big 12 but is not quite sure if they'll expand soon or not possibly for another 5 years. He thinks that there is going to be some movement of existing Big 12 or SEC teams which would open up a spot for UCF.