Blizzcon is officially underway today, starting with a presentation showcasing the Worldwide Invitational tournament held earlier this year. A company spokesman went on to talk about the tournaments being held for World of Warcraft 3v3 Arena, Warcraft 3, and Starcraft 2, followed by word that Starcraft 2 was not yet ready for beta, but that Blizzcon attendees would be included in the first round of testers when the beta program starts. The big news of the presentation, though, was the unveiling of the Wizard class — the third such class to be announced, along with the previously mentioned Barbarian and Witch Doctor. Read on for some more details.