Blizzcon 2011 kicked off today, and the biggest announcement from the opening ceremonies was the development of a new expansion for World of Warcraft. Titled Mists of Pandaria, the expansion will focus on the battle between the Horde and the Alliance instead of a traditional Big Bad Enemy. There will be both a new race — Pandaren — and a new class — Monk. The level cap will be raised to 90, there will be "challenge mode" dungeons, and they're introducing a pet battle system. Blizzard also mentioned that people who buy a 12-month subscription to WoW will get a copy of Diablo 3 for free.