Who's donating their autograph this time around? Wei Wang, the artist behind the now-iconic image of Arthas and Frostmourne, which is plastered all over Wrath of the Lich King products. Wei Wang is also rumored to be the new Son of the Storm, the artists that basically fuel and control Blizzard's aesthetics. So while this might just be a mouse pad that he's signing, it might as well be a part of Blizzard history if you're into that sort of thing.
Head over to their Facebook page and follow the supplied instructions. Good luck!