So many good ideas in this thread. Just to point out a few of the ideas that I love, and maybe build on 'em a little.
Make each book also come with an audio book version that links to my Battle.net account. During gameplay, allow me to walk into Cain's house and access his "library" which contains all the books\chapters I have associated to my Battle.net account. Have each section of the book broken up via a table of contents...and allow me to listen to the book in the game. I want to be able to listen to one entry\chapter, a group of entries...or...press play on the whole darn book. There could also be a main menu navigation for this content, as well as "on the fly" access so I can listen while adventuring.
I would also be able to read these books in game with a nice, customizable layout. I'm thinking about altering the font size, page color, maybe even some interactive art...or a button to simulate a candle flickering off screen that affects the page illumination. Ever read a book by candlelight? You get the idea.
It might be handy to pump in some of the spectacular in game music while reading...
**Consider releasing new chapters that are much smaller than a full book, and make them available via digital download. Maybe even make an NPC interaction where the purchase can be made in game. Dunno...that might cheapen the experience. Microtransactions are a sensitive thing, and The Book of Cain definitely feels grand, and worthy (if you catch my drift). Making some NPC sell pieces of a digital book may take away from what The Book of Cain did successfully as a "brand booster", so to speak.**
I would love books told from other perspectives. Book of Tyrael, Book of Mephisto, Book of Tal-Rasha, Book of Horadrim, etc.
I think it would be incredible if future books (and maybe even a re-release of The Book of Cain) were actually in leather bound, thick, hard cover, tomes...with raised surfaces and some sort of metal ridges outlining the corners. Perhaps there could be two versions. One could be the hardback style that exists today for The Book of Cain. The other could be a premium worn, leather hardcover as I am describing here.
Whatever the future holds for these book entries, I would prefer the writing style and story organization to stay EXACTLY the same as The Book of Cain. Obviously, stories told from different characters would have a different emotional tone. When I refer to the same "writing style", I mean the feeling that The Book of Cain pulled off. While reading it, I felt a teacher was schooling me and a few others while around a fireplace. Yea, keep that writing style. It works beautifully.
Edited by D3BETA on 4/8/2012 9:35 PM PDT