The official Dreamcatcher forum (albeit in French) reveals that People Can Fly is already working on the first patch for their FPS Painkiller. There is no specific release date mentioned and details are sketchy, although it is said to fix various fix but more importantly contain new multiplayer maps. Whether this is only for the French/European or also the North American version is not specified, although juding that the game is due out in a matter of days, it will most likely be valid for all versions.
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