Deep Silver, the publisher of Dead Island, has announced that the Bloodbath Arena has a release window of mid-November. The DLC was supposed to launch in September following the game’s initial release, however bugs and glitches plagued the game forcing the developers to work on a patch rather than the add-on.
Bloodbath Arena will be a Horde-style game mode, where wave after wave of increasingly difficult zombies swarm the player and his/her friends. The add-on will feature four new areas of the island, as well as a new weapon called the Brain Bomb.
The Bloodbath Arena DLC should be available halfway through November.
[SOURCE]