Oh wow. Uh, the What's Next panel for WoW, the Reaper of Souls stuff for Diablo, Heroes of the Storm just to see how it is going to turn out, which characters will be in it, how it looks. I am so excited for Blizzcon it isn't even funny! Even if I can't go I'll sure as hell be on MMO Champ obsessively waiting over new info.
Most excited for the Warfaft Movie update! Everyone already knows what the next expansion is going to be...excited to see what they will do with it but the movie is a long time coming!
I'd have to say I'm most excited for the Heroes of the Storm panels, the one I'm most excited for out of the three being the Live Matches. It's always exciting to see gameplay.
warcraft movie presentation. Really curious how that will make the jump to the big screen. Would also check out as much dIII and hearthstone goodness as possible.