Here is a short summary of announcements in BlizzCon:
New Hero Xalatath added to Heroes of the Storm: https://www.youtube.com/watch?v=4kMhUVz4q5I
Diablo Netflix series. (More in works/plans)
StarCraft Dominion: https://www.youtube.com/watch?v=9eQUtOQXYgQ
Overwatch new hero Doctrine:https://www.youtube.com/watch?v=h5dwH7nx9do
Diablo 5: https://www.youtube.com/watch?v=GxCN_AKYtts
Heartstone new expansion Reign of the Black Empire Cinematic: https://www.youtube.com/watch?v=imZ4rqFbHFc
Heartstone new class Monk: https://www.youtube.com/watch?v=nY2_pygsg1k
Next part of World Soul saga World of Warcraft: Eclipse:https://www.youtube.com/watch?v=tlJZzTcHrH0
Next WoW expansion. World of Warcraft: The Last Titan: https://www.youtube.com/watch?v=F9Xb5PhF5pc
“Wow: Classic+”, World of Warcraft: Forever: https://www.youtube.com/watch?v=uQuKE0KDgiM
Warcraft 3 DLC, Warcraft III Reforged: Forsaken Kingdom: https://www.youtube.com/watch?v=I1kXClUCyuA
Just some minor notes, Dominion is just the name of the cinematic, the game doesn’t have an announced name yet (unless they’re calling it just Starcraft, which would be weird).
The Last Titan expansion wasn’t revealed for the first time here. I think during the last Blizzcon a few years ago, when the World Soul Saga was announced, they went through the three expansions, their names, some overall themes, so you might find a bit more info in those videos, if you’re interested.