Despite some vague-ish comments from Valve that this wasn't the case, a video turned up on the Payday: The Heist YouTube channel indicating that Valve is working in some capacity with PayDay developers Overkill on something called No Mercy, which will explore the origins of the zombie virus from Left 4 Dead. The video was quickly pulled from the channel, but was then grabbed by IGN and subsequently posted to youtube by several other users.
Kotaku · Harris O'Malley
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