Originally scheduled for release around the 15 November, it appears that the release of the Book of Cain has now been pushed back by a month. According to an email Risingred received from Amazon, the release date is now the middle of December
Deckard Cain, Blizzard Entertainment “Diablo III: Book of Cain”
Estimated arrival date: December 16 2011 – December 20 2011
There’s no explanation for the date being pushed back but maybe Blizzard are looking to get the book in the hands of fans closer to the actual game release.