Here is an overview of the game, via Bohemia Interactive:
Unlike the traditional “zombie,” the hostile humanoid A.I. in the DayZ universe are very much alive. They are angry, screaming, filthy, fast A.I. you encounter throughout the Chernarusian countryside and can be killed with shots to the body, rather than just head shots. Don’t worry, player character in DayZ are immune to this virus, and will not turn into zombies when bitten.
Watch a cinematic trailer below.