If you like you daily dose of Diablo 3 to come in a handheld, bookbound form then you may want to preorder the Book of Tyrael, the new Diablo compendium. The Book of Tyrael expands on much of what is referred to in the games as it’s stuffed full of concept art and lore entries.
According to Blizzard, “the Archangel of Wisdom reveals never-before-known secrets about the history of the world, the dark threats that yet face mankind, and his decision to join the ranks of humanity as a mortal. It also includes letters from Leah and additional fragments of Cain’s writings, all curated by Tyrael as he weaves together a series of complex and fascinating stories for future generations.”
You can preorder a copy of the book from here.