The cover art is slightly different from the original product image. The fat alien is replaced with Lem, the main character of the movie.
This book is published by Insight Editions but doesn't come with any of special enhancement (e.g. pullouts, cards) you sometimes see with their other books.
Planet 51 is the other animated movie this year featuring aliens, the other being Monsters vs Aliens. The cast is of course different, and the set is not on Earth but on Planet 51. Planet 51 is the debut film of Madrid-based Ilion Animation. The concept artists, based off the names in the captions, seem to be all from Spain. The whole film was produced entirely in Spain.
There are more than 400 pieces of concept art in this book. Each character comes with lots of sketches. The background paintings are very beautiful and scenic. There are also many alien set and prop designs. It's like looking at a parallel universe where everything looks familiar but different. The aliens have their own version of the famous Flatiron building in Manhattan, suburbia, Area 51, vehicles, utensils, etc.
My favourites are the background and set paintings, some of which are very detailed. This book has top notch art work and variety. There are short commentary on the art and concept.
It's a visually delightful book, highly recommended to character designers and animation lovers.
(There are more pictures of the book on my blog. Just visit my Amazon profile for the link.)