Seven years since the release of Diablo III, Blizzard has officially announced Diablo IV at Blizzcom. Unfortunately, however, Blizzard hasn't announced an official release date with the title still anywhere from 12 to 24 months away although the first game play trailer has been released to whet gamer's appetites.
https://www.notebookcheck.net/Diablo-IV-gets-official-first-gameplay-trailer-launched.440717.0.html