UPDATE Payday: The Heist Devs Working With Valve Not On Left 4 Dead Prequel

UPDATE: Valve's Chet Falishek quashed this rumour by stating that while Overkill are collaborating with Valve, it is not Left 4 Dead prequel. So no Left 4 Dead prequel.

PC Gamer posted that a 'reliable source' has confirmed with CVG that Overkill Software, developers of Payday: The Heist, a Left 4 Dead type bank heist co-op shooter are working with Valve on a new game. The big news is that it's not any game... but a Left 4 Dead prequel. That could be rather interesting. It is interesting to note that Valve's absence from E3 might mean that this game might be some ways off from an announcement. Apparently the game will tell the story of the zombie outbreak and will blend the gameplay from Left 4 Dead and Payday. Overkill are also working on a sequel for Payday: The Heist.

Source: PC Gamer