I received my copy on the afternoon of December 24th, right on time for Christmas. The book looks amazing on the outside, with the Red band encircling it inscribed with the Diablo 3 logo forming a bookmark, fixed firmly to the inside of the back page of the book.
The book itself has a layered relief of a demonic skull as the cover, with the back cover shaped into a large sigil of some kind. This sigil is only shown in the book once, in association with the nation of Xiansai.
Inside you'll find the entire story of the Diablo series up to the start of Diablo 3, along with descriptions of relevant religions, philosophies, regions and characters from the universe accompanied by many pencil illustrations all printed on paper made to look like old parchment. At the back of the book is also an envelope containing a gorgeous map of Sanctuary, the world the Diablo games are set on.
In all this tome represents a pretty complete collection of knowledge of the Lore of the Diablo setting, up to the start of the 3rd game that is (although regions from the 3rd game are described in some detail). While not essential, this book is a great repository of knowledge that any Diablo fan would be proud to have in his collection.
PS: The only negative mark I have about this book was the quality of the copy I received. The cover was flawless but the pages of the book were rather roughly cut during binding, making the outer edge feel very rough as well as giving it a somewhat shoddy appearance and probably making it more prone to being damaged, as there's a lot more surface area for stuff to get caught behind.