I've had mixed experience with "Art of" books. Some of "Art of" books just contain a few movie stills. Others, especially for animated movies, contain far too much about the process of digitally animating the film. While the process of digital animation can be fascinating, I personally don't find the digital "skeletons" for animated characters to be visually appealing.
Fortunately, The Art of Star Wars: The Clone Wars contains a copious amount of genuine art. The book has a lot of concept designs, light concepts, and maquettes of characters and scenes from the film and every episode of the first season of the TV show. By far the most common form of art is the lighting concept, which the artists use when adjusting lighting in the final show. However, these are not simply stills from the show - they have their own unique texture.
One added bonus is that the book contains many of Dave Filoni's own drawings. Filoni has a very unique style, almost blurred. I sense that these are speed sketches to nail down character concepts. However, they have their own unique energy and are wonderful to look at. It's also fascinating to see how the supervising director visualizes Star Wars artistically.
The book does contain some commentary about the making of the show. There are some fascinating insights. I found it particularly interesting to see which characters/planets/story arcs George Lucas personally approved or pushed for. Unfortunately, this is an "Art book" and the short commentaries will probably leave many hungry for more. I'm sure Lucasbooks will publish a "Making of Clone Wars" when the series is over. However, I do hope they stick to the format of this book, focusing a few pages on each episode - each episode deserves at least some attention.
Definitely recommended for fans of the TV show.