Disney: Could "Up" Be Pixar's First Dud?

One of the remarkable things about Pixar is that the Disney unit has never produced a flop. It’s an amazing list: Toy Story, A Bug’s Life, Toy Story 2, Monsters Inc., Finding Nemo, The Incredibles, Cars, Ratatouille and Wall-E. Nine movies, nine success stories. Can they make it 10 for 10?