You've probably heard by now, but Mizzou is going to the SEC to balance the conference at 14.
One interesting thing: Missouri will play in the SEC East, which obviously makes almost no sense geographically (though it is relatively close to Kentucky and the Tennessee schools which are all in the East) and it's permanent rival will be Texas A&M. My solution would be to move the Alabama schools to the East, and move Vanderbilt west, along with the two new schools. You would lose Alabama-LSU (the Nick Saban bowl) as every year games, but you would gain Alabama-Florida every year. Permanent rivals would change as follows (the other three stay the same):
It will be interesting to see if the SEC goes to 9 conference games like the B1G, Pac-12 and Big XII. It's not much of a conference if you don't play 5 teams per year, and potentially go half a decade between seeing opponents.