Visitors to this year’s BlizzCon will receive a bag full of goodies when picking up their convention badge.
The bag may include, among other things:

The Murlock Suit: A special World of Warcraft code that can be redeemed in-game, providing one of your WoW characters with the Murlock Suit.

Beta Key: Access code to the yet to be announced beta test. There is no guarantee that the key is StarCraft 2’s beta, but the chances of Diablo 3 being announced are slim.
Colossus Fridge Magnet

Show Guide - detailing the BlizzCon show layout, along with some unique colorful articles by Blizzard.
World of WarCract J!NX T-Shirt
Heroes of Azeroth Starter Deck: starter deck for the popular World of Warcraft Trading Card Game. Moreover, Upper Deck Entertainment will be providing explanations for newbies and holding tournaments at the event.

The bag may also contain additional StarCraft/WarCraft/Diablo souvenirs such as coasters, button sets and other nifty surprises from Blizzard and BlizzCon’s sponsors.




From the Starcraft 2 Blog.