State of Decay Multiplayer Cut, Windows 8 Exclusive Undecided
We announced that we would not be able to launch State of Decay with co-op mode, said the rep. Since [MMO follow-up] Class4 is the online world version of State of Decay, well be developing the multiplayer goodness, and our hope is to bring some form of co-op mode to State of Decay after launch.
One thing of concern that the article does bring up is that Microsoft is the publisher for State of Decay, and this could possibly mean that the PC version of the game may be a Windows 8 exclusive title, something that Undead Labs could not confirm nor deny at the moment, but RPS notes that some other Microsoft published titles for the PC are already taking this approach.
Source: Rock, Paper, Shotgun