There are actually 4 packs from 4 different retailers. Amazon has a pack that includes a code that unlocks a special “Goodbye Katty” gun and an exclusive 16 page comic preview. Gamestop has the Greed and Betrayal Multiplayer Pack which includes a new map called Radio Tower. Bestbuy has a pack of 6 Chinese novelty mask’s to wear in multiplayer, and Walmart has a multiplayer focused strategy guide.
There is also a co-op trailer for you to enjoy.