Sounds like a cult bible right? Well… you might be right there. It is, after all, a story about the world of Diablo. Hehe.
The hardcover release will be on December 12. There are no news yet if a paperback edition will be published. The book contains stories from and the history of Sanctuary, its inhabitants, and the major characters of the world.
“Designed as an “in-world” artifact from the Diablo universe, Diablo III: Book of Cain includes Cain’s revealing meditations, as well as dozens of sketches and color artworks depicting the angelic and demonic beings who wage constant war with one another.” (http://diablo.wikia.com/wiki/Diablo_III:_Book_of_Cain)
Might get myself a copy of this one. Hehe. I love fantasy artwork.