Redeem your gift on Blizzard's website Battle net to get exclusive in game content for the following games on your Blizzard account: Hearthstone, Starcraft 2, Diablo III, and World of Warcraft. 

Hearthstone Card - Mystery Minion

Starcraft II - Portrait & Decal - Tearin' Stitches & Stitches' Hook

Diablo III Banner - Mark of Death

World Of Warcraft Pet - Murkalot

**Battle.net account required**

I have other Blizzcon exclusive items, feel free to ask :)