The Star Wars Expert Guide was released today (18th April) through Tesco Stores in the UK. It was given away free to anyone who pre-ordered a copy of the movie on DVD or Blu-Ray. It's retailing on it's own for £4.99.
As for size, it's about the same size as a Blu-Ray case. It contains material from 4 previous books. The Force Awakens Visual Guide (2015), Beware the Sith (2012), Battles for the Galaxy (2011) and Mysteries of the Jedi (2011), The first half of the book is dedicated to the Sith and Jedi, the next lot of pages is mainly about the Clone Wars and Clone Troopers. The last half of the book is mainly about the Empire and then onto The Force Awakens material.
Overall, the book is alright. It'd be good for younger fans who want to get a concise rundown of the Star Wars Saga in 62 pages. I'd say this is for kids or hardcore fans.