At Least Diablo III, the Book, Will Be Out This YearMichael McWhertor6/29/11 4:40pm74EditPromoteDismissUndismissHideGo to permalinkThere's still no firm date on Blizzard's next entry in the Diablo series, but at least one of the game's official tie-ins, Diablo III: Book of Cain, is expected to arrive in 2011. So what is Diablo III: Book of Cain?