The release date for Blizzard's upcoming World of Warcraft expansion, Legion, has been leaked online just a day before BlizzCon kicks off. The date was spotted online in an image hosted on the Battle.net website which reads, "Expected game release on or before September 21st, 2016."The image also details some pre-purchase bonuses, including a Level 100 character boost and early access to the new Demon Hunter hero class.