The Art of Tron: Legacy is more of a visual companion than an art book. Whenever there's "art of" somewhere in the book title, it sets people up with certain expectations. This title definitely sets up the wrong type of expectation, at least to me.
About half the book is concept art and the other half is just film stills, and even if it's not exactly half, it feels that way.
Much of the concept art are actually the finalized designs. You won't see much iterations. It's like they nailed the design of the Light Cycle bike with the first try. Same applies for characters and environments. And the Light Jets are missing.
The selection of films stills included is also questionable, but I'm glad for the most part they look stunning visually, especially the ones that are showing more of the Tron world.
This book should still appeal to Tron fans. I'm not so hot about the book, but I've two colleages (fans of the film) raves about it.
As an art book, I'll give it 3 stars. As a visual companion or picture book, 4 out of 5 stars.
(There are more pictures of the book on my blog. Just visit my Amazon profile for the link.)