According to what is reported by the Linkedin profile of Nick van Dyk, co-chair of Activision Blizzard Studios, Diablo ed Overwatch they will have their own animated series. According to reports from the former producer of Skylanders Academy, Diablo will receive an "anime-style" adaptation, just like Castlevania, although the project is currently still in pre-production, and will be distributed worldwide by Netflix.
Finally van Dyk in his post he also talked about Overwatch, stating that he would be working with his creative partner on an animated series based on the well-known franchise of Blizzard. At the moment nothing official has been announced and it is not clear who will distribute the new project of the US company.