Does IGN know something we don't? Well, most likely yes, but what about all things concerning LucasArts? In its "Most Anticipated Games of 2004" article, IGN lists Knights of the Old Republic 2 (though not from Bioware), Rebel X (a compilation of Nintendo Star Wars games), and a mystery Episode III game in which you play as Darth Vader.
Additionally, we at Mojo have heard a few rumors of this Darth Vader game as well, and that it may or may not be the pet project of Jon Knoles. In case you're unaware, Knoles previously wrote and directed Bounty Hunter, which was another game developed concurrently with the production of a Star Wars film.