The AT&T Cotton Bowl announced on its Twitter page that Texas A&M of the Big 12 will play in this year's game.
The Aggies will face an SEC team, most likely from a group including Alabama, LSU and South Carolina, if the Gamecocks lose to Auburn in the SEC title game.
The SEC still has to fill slots to the Sugar, Capital One, Outback and Gator Bowls. It seems likely that Arkansas (10-2, No. 7 in the BCS) will go to the Sugar IF Auburn plays for the BCS national title.
My guess is that Alabama or LSU goes to the Cotton Bowl and whichever team doesn't go to the Cotton plays in the Capital One Bowl, probably against Michigan State. If South Carolina loses to Auburn in the SEC title game, the Gamecocks appear likely to land in the Outback. Florida seems to be a popular choice for the Gator Bowl.
As far as the Big 12 goes, Nebraska, Oklahoma, Missouri and Oklahoma State -- all 10-2 -- will be slotted into the Fiesta, Alamo, Insight and Holiday Bowls. The winner of the Big 12 title game -- either Nebraska or Oklahoma -- gets a BCS bid and will play in the Fiesta. The loser could end up in the Alamo. Missouri and Oklahoma State would be chosen for the Insight and Holiday.
Texas A&M is 9-3, winners of six straight game. The Aggies have beaten both Oklahoma and Nebraska this season.