I thumbed through this today at my local Barnes & Noble. It's a brand new book...not a compilation of the 4 visual dictionaries. Overall the book looked quite nice. The sample pages posted give you a good idea of what to expect. Basically, the book cycles through all the major events in the saga. Lots of expanded universe stuff from the comics was covered as well. Unfortunately, most of the photos I had already seen. And since I'm only really interested in finding cool reference photos, I didn't have much use for this book. I'd be very tempted to buy it on sale though.
I forgot to check the page count, but 144 sounds about right.