1. Wow expansion, classic and remastered stuff
2. Diablo 4 and diablo 2 remastered.
3. Probably a Overwatch 2 since Overwatch doesnt have a Overwatch Update panel like Heroes of the storm and Hearthstone.
4. something new yet unknown
But since both Heroes of the storm and Hearthstone have update panels, im pretty sure that those number 3 and 4 has nothing to do with those games.