A new behind-the-scenes book on the Force Unleashed video game is out today, and its pages are bursting with fantastic Star Wars concept art. The book, written by video-game writers W. Haden Blackman and Brett Rector, tells the story from the first concept still to the finished game. It also explains their original pitch to George Lucas (under the name The True Jedi Trials), the technology behind the video game and the saddest pictures of a half-naked Vader you've ever seen. Click through a gallery of new Star Wars art, including the sad state of the planet Kashyyyk after Vader finishes kicking Wookiee butt.