Last month, it was announced that Overkill’s PAYDAY: The Heist and Valve’s Left 4 Dead would come together, through a sort of crossover. Not in the form of a full game, but rather, in the form of some sort of DLC release – much like how the Potato Fools’ Day cross-game events played out (but with none of the glyph hunting and potato farming).

Well, it turns out that Valve and Overkill are not kidding around, as a teaser trailer has just been released for PAYDAY: No Mercy.

Valve continues their awesome L4D2 support with Week 15. This week’s Xbox 360 mutation is the encore mutation “Four Swordsmen of the Apocalypse”, which features all 4 Survivors facing constant streams of Special Infected with nothing but Katana’s, and this week’s PC mutation is also an encore mutation. “Versus Survival” is essentially the classic Survival gamemode, except the Special Infected are controlled by players. The voting breakdown for the two platforms was: