New Blizzcon is approximately 10 days away and things might get interesting. There is talk all over the webs about Diablo 4 leak, something we kinda expected but you never know how true these things are until the day of announcement.
Blizzard desperately needs a win one year after that horrible Diablo Immortal announcement fiasco (don't you guys have phones), it was an epic way to alienate their core audience of PC gamers who grew up playing Diablo games. Probably the worst decision ever for Blizzard to announce that game the way they did it on last Blizzcon.
Naturally their stock plummeted after that fiasco and hasn't recovered still, hundreds of Blizzard employes lost their jobs, their last Wow expansion wasn't great, also with recent banning of Hearthstone player for talking about Hong Kong protests, then reducing his punishment after everyone's outcry, clearly Blizzard needs to do something epic to redeem itself, or at least do something to reduce the damage done to public perception of their company.
Announcing Diablo 4 might just be that win they are looking for, sure it would just be an announcement, the game will probably be done far into the future, like their games normally do. Blizzard always had the longest development cycle for their games.
When we consider their other franchises like Starcraft, I don't expect to see anything there. Money making machine Hearthstone will have a new expansion, they will probably announce beta testing for Warcraft Reforged, maybe some new characters for Overwatch, perhaps Wow expansion and that's it. Interestingly they are still not letting their moba Heroes of the Storm die out with announcement of playable Deathwing. Clearly all roads lead to Diablo 4 announcement. Let's see 10 days from now what happens.