The news was announced at BlizzCon 2007, where producer Thomas Tull (300) said that the film would be released sometime in 2009 and is targeted for a PG-13 rating. The film will be set approximately a year before the start of World of Warcraft, and interweaves the story of various races, lands and a new hero into a two and a half hour feature told from the Alliance perspective.
The flick will be live-action and will incorporate "CG environments and effects". No director is attached as yet. More news as and when.