You may have heard through the grapevine that Payday: No Mercy was getting a zombie level, specifically the No Mercy one from the original Left 4 Dead. The implication was that the thieves would be involved some way in the zombie outbreak from Left 4 Dead. While the level No Mercy is the inspiration, sadly there doesn't seem to be any actual zombies.

What you can expect from Payday: The Heist - No Mercy is a fun tribute to the classic zombie game with plenty of easter eggs scattered around the hospital. If you're a fan of either of the games it certainly looks like it's worth checking out. To add to the mystery though the trailer has been taken down by developer Overkill Software.

Perhaps the zombie apocalypse is beginning already at Overkill's Stockholm office, or maybe there was a problem coordinating between them and the Left 4 Dead people. No official statement has been released about the trailer except to say that it is not "canon" in the Left 4 Dead universe.