There have been rumours circulating for years around the mythical Diablo 4, and for the first time ever, we may have some real evidence that a sequel may be coming out within the next few years. While there havent technically been any official announcements from Blizzard regarding a new Diablo, the current state of affairs with Diablo 3 paint a promising picture for those who have been waiting almost a decade for a new game.
Source: N4G PC Diablo 4 When Is It Coming Out?