Looks like we'll be seeing new Dead Island content next month. Deep Silver announced today that their co-op zombie action game will be expanding by more downloadable content next month, on February 1. Well, January 31 if you own the game for PS3.
In the Ryder White DLC, players will be switching campaign perspectives to the game's antagonist, making Ryder White a playable character in his own single-player adventure. For $10, the new DLC throws in new weapon blueprints and should offer "several hours" of gameplay. Might be worth checking out, assuming you've finished the core game.