Blizzard has numerous 'Diablo' projects in the works
 

Diablo III isn't the end of Blizzard's interest in its hellish action RPG franchise. Community Manager Brandy Camel has revealed in a video that the developer has "multiple Diablo projects" in progress, and it might have "some things" to show later...

https://www.engadget.com/2018/08/08/...s-more-diablo/