Sounds like the Big 12 is in discussions with Arizona, Arizona State, Colorado, Oregon, Utah, and Washington. I'm honestly surprised at this list. I'm surprised Colorado, Oregon, Utah, and especially Washington didn't want to try to get into the Big Ten. I'm wondering if ASU and Arizona were a package deal and ASU was never getting in. Ditto with UW and Oregon without Oregon State. Colorado and Utah would both be good fits but didn't really have an obvious dance partner unless it was both.
Anywas, the Big 12 without Texas and OU is... a bold choice.
Also noteworthy is that Cal and Stanford are both left out of this. Which makes me wonder if the Big Ten is already in advanced discussions with them. Because both would be killer adds academically. Stanford being an obvious very good add for athletics as well. TV Markets, both are big adds to grab the SFO-SJ market.