Your Friend The Rat
Apparently a new Pixar short – their first with extensive 2-D traditional animation – will available on the Ratatouille DVD and Blu-Ray Discs (on sale November 6th). The short was directed by Jim Capobianco, who says he was particularly inspired by Ward Kimball, and was written by Jeff Pidgeon and Alexander Woo.
Sci-Fi.com has some more information. Animated-News has posted several stills.