GSC Game World announces September 15 as the new North American release date for S.T.A.L.K.E.R.: Clear Sky, after the shooter prequel was delayed from its planned September 5 release (story), reportedly due to the absence of CD keys in the package. GSC also says "The digital download release date has not yet been determined," but Valve made an announcement on Friday (story) likewise saying the Steam edition of Clear Sky is due on September 15.