Blizzard has updated their Blizzcon page with info about the virtual goodies that come with your $40 Virtual Ticket to the online PPV version of the show. They include a WoW pet, a SC2 decal, a Hearthstone card, and for Diablo 3 you get $50 in virtual money to spend in the RMAH before it closes.
No, not really. You just get a banner sigil.
Blizzard has not revealed the contents of the goodie bag that show attendees will receive, but most likely they will include these digital goodies along with other more tangible delights.
The Diablo banner is already in the game and functional if you buy the virtual ticket; a forum goer named LoverofBacon posted a screenshot of his two weeks ago.