I guess it is for young adults. Don Hahn is also a good teller, and he adapted the animation process for that age group perfectly.
Images inside the book are beautiful but the content is not enough for us, the people who involved with animation.

I'm waiting a solid book from him with full of details and stories. I think he can do it, he's part of the Disney renaissance and after watching "Waking Sleeping Beauty" I'm really convinced.