Capcom have gone on the record at X10 and said that zombie slaughter sequel Dead Rising 2 will be released in Europe on the 3rd September on Xbox 360 and PS3.
Xbox 360 owners can get a sneak preview if they download Dead Rising 2: Case Zero, a prologue created exclusively to bridge the first game and the sequel. That will be available in August and no price has been specified. If it is, as some suspect, a glorified demo, it will likely be free.
It will be completely standalone though and will not feature content from either game. With the trailer already having been released months ago, the wait may seem excessive, but the game has obviously undergone a lot of polish.