From THQ:

"THQ will release a new and as yet un-named expansion pack for the award-winning real-time strategy Warhammer 40,000: Dawn of War with the original game's developer Relic Entertainment at the helm once again. The add-on will include all-new explosive Dawn of War single player action, new multiplayer content and two new playable races including the technologically devastating Tau, bringing the total number of playable races in Dawn of War to an unprecedented seven. The new expansion is set for release this Autumn."