Dead Rising 4 is on sale on Xbox live, I know you could not play co-op campaign but wondered if they added it in the DLC stuff. $25 with Season pass is a good deal.
I am pretty sure there is no co-op specific DLC. One of the DLC is set after the ending of the game and it is total crap. The other is like a mini-game. Then there was the Holiday pack or something for Christmas themed costumes and weapons.