You may note Eric Tan as the artist that created those clever Incredibles, Ratatouille and WALL•E stylised retro posters for the films. Well Eric was also present at this years San Diego Comic Con and Koyla from the Pixar Planet Forums bought a poster from Eric. This was not just any poster, it was an Up poster (pictured).
You can see the original image at the link provided in the forums, however I’ve fixed up the image and you can view it full size by clicking on it. I hope Eric has created more posters for the film just as he did for The Incredibles, Ratatouille and WALL•E.