Developer Undead Labs has confirmed a State of Decay release date of June 5 via Xbox Live Arcade.
The game has been previously confirmed for PC, but no release date for that platform has been announced.
The game was originally announced in 2011 as 'Class 3', before disappearing for a year and re-emerging as State of Decay in mid-2012.
The developer describes State of Decay as "a 3rd-person action game set in a dynamic open world," ambitiously promising that "the open, sandbox world develops in real-time, shaped by your actions, dynamically generating content based on your choices and the ever-increasing zombie threat."
Check out the most recent State of Decay gameplay trailer here.