Starting now, the studio wants 2,500-7,500-word short stories based in the Diablo, StarCraft or Warcraft universes. If your piece is picked, you'll win a trip to Blizzard HQ in sunny southern California, where you'll meet some Blizzard writers and receive either a Diablo III "Overthrown" barbarian diorama or a Frostmourne sword.

Seven runners-up will receive prize packages containing the Diablo Archive, the Warcraft Archive, the StarCraft Archive, and the Warcraft: War of the Ancients Archive--all signed by various members of Blizzard.
If this sounds like your jam, then follow this link to the FAQ. You'll get all the information you need.
Image via GenzoMan at DeviantArt