According to a report on CVG, Overkill Entertainment - developers of multiplayer shooter Payday: The Heist - are currently working on a new Left 4 Dead title.
While some kind of crossover title was announced between the pair last month, this report is a little more specific, claiming that the new game is a Left 4 Dead prequel that tells the story of how the zombie outbreak came to kill, well, almost everybody.
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E3 2012: Rumour: Left 4 Dead prequel coming from Payday dev [CVG]