State of Decay was originally an Xbox 360 and PC single-player zombie survival title. Featuring third person gameplay with an in-game world with limited amount of resources, the players could traverse the game, recruiting other survivors to better aid their survival. Meeting new survivors allowed players to take control of them, send them out for missions, etc. allowing players the ability to manage an expansive team of survivors.
The remastered State of Decay: Year One Survival Edition will launch for the Xbox One on April 28th in NA. With it will also come the two existing DLC: Breakdown and Lifeline, adding additional gameplay and characters. The trailer can be seen below.
Source: Xbox Youtube