With the success of Konami bringing Castlevania to Netflix (check out the official Season 2 art by the way, Blizzard might be looking to join in.
Keep in mind that this is just a rumour at this point.
According to the Revenge of the Fans site, rumblings have Andrew Cosby (of Hellboy fame) being tasked with writing the Netflix series. There’s no real evidence to lend creedance to Diablo being adapted for a series, let alone being brought to Netflix, other than the video regarding “the future of Diablo“. Even then, the video didn’t go into specifics as to what Blizzard might be showing us later this year. Presumably, if Blizzard is moving forward with an adaptation, they would be mentioning something at this year’s Blizzcon in November.
The Diablo franchise has a couple of things cooking for it at the moment, namely the Nintendo Switch port and the upcoming comic book. And yeah, there are also those rumours of a remastering of Diablo II, and that new project in the Diablo universe.
Stay tuned, as they say.