Overwatch - New map "Blizzardworld" Yes they made there own theme park.
New Hero - Moira
New Cinematic - Honor and Glory
World of Warcraft
The biggest thing would be World of Warcraft Classic. Now we know why Blizzard has been going after some of the largest unofficial WoW classic servers.
Next Expansion is Battle for Azeroth.
Overwatch is possibly the biggest game in the world, any news is good news. Funny one of the people asked during the QA session if there were plans for a real Blizzard World and Blizzard said no.
As for vanilla servers, stupid idea. I don't think people remember just how freaking challenging vanilla was, almost to the point of being impossible at times, unless you, gasp, teamed up with others to tackle things. Spamming trade for groups was how you made a group to tackle dungeons, and lets not get started on 40 man raids that actually needed 40 people. Players are too casual now, the game has been fine tuned and simplified, vanilla died and should stay dead.
As for the next expansion, meh, its the filler expansion before the next big storyline, it holds true to any and all past expansions, the next expansion will be the big announcement, this one will put that one into motion,
Blizzcon is a spectacular every year. Its a true tribute to the fans and hypes Blizzard's upcoming products. Granted pretty much all of Blizzards games are home runs and huge sellers and you can't really say that about other publishers, but it makes me wonder why all gaming publishers don't do this for their fans.
BTW, Chris Hardwick is terribad, bring back Jay Mohr.