Blizzard has posted a few sample pages from the upcoming Book of Tyrael, and added the news that it is now available for pre-order.

Emblazoned with the emblem of the Horadrim and featuring over 140 pages of tantalizing text, Diablo III: Book of Tyrael is a stunning follow-up to Diablo III:

In addition, Diablo III: Book of Tyrael features a fully removable illustration of the Leoric family tree and other influential characters from Old Tristram including Deckard Cain, Prince Albrecht, Archbishop Lazarus, King Leoric, Prince Aidan, Queen Asylla, Leah, and Adria.
In preparation for its release in October, Insight Editions has launched a special landing page for this remarkable companion book. Adventurers keen to journey deeper into the depths of Sanctuary’s lore and experience every last inch of this heavenly artifact can visit Insight Edition’s site for more details about Diablo III: Book of Tyrael.
Interested in reserving a copy of your own? Make sure to place your preorders to be among the first to experience this new chapter in Sanctuary’s continuing saga.
You’ve got to hand it to Tyrael. After eternity as a floating glowing occasionally-nagging angel thing he crashes to earth in a fireball, suffers amnesia, gets tortured by halfwit Cultists, regains his memory, and then while tagging along and issuing useless advice during the hero’s journey through Alcarnus and the pit formerly known as Mt. Arreat, he somehow finds time to write and illustrate a history book in the exact style and handwriting of the recently-deceased Deckard Cain. Meanwhile most humans alive today can hardly manage a five page book report, and we’ve got Wikipedia to copy from!