Dunno what to expect from it. At best we get D4 release date and the chance for beta soon. Thats at the VERY best, so likely wont happen.
HotS & SC2 has nothing going for them. Would be VERY surprised if theres new stuff coming here(like SC3).
OW probably gets a update on how OW2 is going, maybe a new map, maybe a new hero. OW2 probably delayed.
WoW - Info about 9.1, thats about it for that game.
For a couple of years now I have hoped that Blizzard would knock out a new IP that surpises us. The OW announcement was great at the time and I wish/hope they would dare venture into new worlds. even though Blizzard has changed alot since the hayday of Wacraft RTS games, I do enjoy how the build up games and the worlds within them. With that said - I doubt Blizzard will dare to put out any new IP in several years. They have several games to expand on and with activison there spamming our launcher with other games, they probably dont feel the need to do anything new and daring. It would mean taking a chance, instead of going the safe route and earn big bucks on wow xpacs every two years.