The talk here is you are in if you want. Lots of speculation at:

http://www.cyclonefanatic.com/forum/big-xii-conference/125427-super-mega-huge-big-12-expansion-thread.html

Just go to the last few pages.  The darn thread is over 21,000 posts long - another reason I dislike "Back to the top" forums.  I can't find the revelant posts.  Although there is some   funny?   stuff about Tammy's mason jars