If they did make a physical book, I think it would be cool to incorporate it into XIV as kind of an easter egg. Make it so the book is divided up into 50 or 100 different scraps and throw them all across the world of Eorzea in different means. 10 could be simple ???s, another 10 could be awarded through doing certain quests, another 10 could be dropped of weird monsters in different corners of the world. If you collect all the 'pieces' to the book in-game, you can redeem it for a virtual/physical copy of the real book. Just a thought :P