Briefly: These are the three new Up posters. They are pretty cool and all follow the same style. Nothing really groundbreaking here; just more exciting character art and hype for the movie. Although the detail shown in the dog, Dug, is brand new and quite interesting--especially his collar which is rumored to give him the power of speech. Click here to read more about Pixar's upcoming feature, Up, released May 29 of this year!
Source: The Pixar Blog