An announcement should be made soon about Diablo III. We could expect some new information already at Gamescom (Cologne, August 18 - 21, 2016). It's not set in stone yet whether it will be a major patch or even a new expansion, but Blizzard has officially invited streamer Quin to make a public appearance. He mentioned in on his stream that he wouldn't be going there, but Blizzard gave him such conditions that he couldn't say no, so it's probably about paid transportation, hotel and even an appearance fee.
Gamescom is the place where Blizzard unveiled Reaper of Souls as well as WoW Legion last year.
The issue with Diablo III
Diablo III has gone through some neat changes and it can't be even compared to its former vanilla state, but the problem is players are growing tired of it. A new expansion would be more than appreciated. Content patches add minimum content and Seasons gameplay has been dull for a long time now. It's understandable that Diablo 3 doesn't earn much revenue for Blizzard in Europe, Americas and Oceania (with the exception of Asian realms with enabled microtransactions) maybe that's the reason they shift their focus on games with regular revenue - World of Warcraft, Overwatch and of course Heroes of the Storm.
We'll still have to wait a month. The event starts on August 18. With Quin's invitation, he's probably going to be a public figure for a Diablo announcement.
Blizzard Hiring for D3
There are a few open positions on Blizzard's website where they're hiring for an unnanounced project hinting Diablo 4 or Diablo III's second expansion.
Are you still playing Diablo? What are your Gamescom expectations?