From StarWars.com:
"Chronicle Books will showcase the incredible art and creativity generated for the smash hit television series, Star Wars: The Clone Wars in a new 288-page hardcover. Featuring more than 400 pieces of concept art and exclusive interviews -- including a sneak peek at Season II -- The Art of Star Wars: The Clone Wars presents the story's development through the eyes of the animators, sketch artists, writers, designers, producers, and directors..."

The book will be available in two versions; a standard edition, and a limited edition, with slipcase, exclusive behind-the-scenes content, and portfolio artworks. You can find out more at the above link.