I think they're working on 3 things:
1) D2 Remastered (this was now basically 100% confirmed I believe in a combination of recent articles and job postings and so on). But if they learned any lesson from SC:R they should know this is not gonna be anything else but calming down the D2 nostalgians.
2) D3 new class and some new features (like that boss chamber that was promised at Blizzcon 2 years ago, some new items, maybe some new events to give us more interesting "themed seasons"). Basically, similar to the necro pack. Why? Because I think even if they work on an entirely new game, D3 is still too fresh to let it completely run out, especially with the recent presentation of themed seasons. I also don't think any new Diablo game would be ready for release right away (unless Blizzard now jumps into Steam-style official "early access" BS) and it'll also be a different genre (like Diablo Battle Royal or Diablo Racing or Diablo Theme Park or Diablo Go or whatever).
3) A new Diablo game, which is not Diablo 4 - neither by name nor by spirit. Worst case they'll just try to put it into an existing genre (like MMO or Battle Royal or so), maybe they revive an old genre (like Adventure or Sandbox - I'd love an RPG-heavy Diablo-esque version of Raft, or Terraria, or Rust, or stuff like that - wishful thinking), and best case they try to define a new genre (back to the roots of Blizzard).
The hype they caused with the video and the disappointment after previous years of toilet-sized Diablo stands would make a presentation of "only" #1+#2 turn this into a big meme of overhyping and underdelivering a franchise, so my hope is that they preview #3 and people get excited enough to waste their time until that is available by coming back to #1+#2.
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Blizzard has no other games on the horizon? OVW 2 , wow shadow lands event to the summer game festival, and there are job posting for other 2 games mobiles Unannounced Project and we don't konw if leaked Diablo 2 resurrect is real or fake .
another Lead artist for another blizzard game Unannounced project https://careers.blizzard.com/en-us/openings/oSIFbfwa
Not really surprise If warcraft franchise take mobile title after DI.
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Cab be A Remake start from 0. Remake don't need source code.
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Not chance diablo IV in 2020 . Wow shadowlands is scheduled for december 2020. 2 games blizzard is crashed system of Bnet. spring 2021 or later
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https://www.youtube.com/watch?time_continue=87&v=8CzpX77iBNg&feature=emb_logo&fbclid=IwAR107SizGkSwV-jOKIdzynrDfDHFXwvQn-lsb2Res0x01u3K8t3cCsNe32Uhttps://www.reddit.com/r/Diablo/comments/e3xiw2/the_pale_summoner_is_rathma_blizzards_leak/?utm_source=share&utm_medium=ios_app&utm_name=iossmf
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Diablo 4 incoming , much artworks diablo IV check https://www.facebook.com/marco.rufini.9 or https://twitter.com/Marcazzo81
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Big surprise here for Diablo IV go to check . New images the art of diablo ( diablo 4 images ) no in the web net https://www.facebook.com/marco.rufini.9 or https://twitter.com/Marcazzo81