Deep Silver has announced pre-order bonuses for Dead Island, which includes DLC called Bloodbath.
It contains a single player and multiplayer "Horde-style challenges in four different arenas," and experience points gained through the DLC will carry over the main campaign mode.
Leaderboards will be available in the DLC pack as well as a new weapon called the "brain wave bomb."
Likely, if past history of pre-order bonuses are any indication, the DLC will be made available for a fee sometime after launch. We'll ask.
The Techland zombie actioner is out later this year on PC, PS3, and Xbox 360.