I have it (Courtesy of the nice people at Akadot Retail.). Glancing through it and using my admittingly nearly non-existant Japanese reading skill, there does not seem anything you did see from the games themselves or, with regard to some of the pictures, seen in promotional material released by Falcom. It does put it in one nice tidy package.
Oh christ, I was ready to go: World guidance? in SnK 1 go counter clockwise around the kingdom, in SnK 2 try to do it again and at the lake see where the linearness takes you.
This comment really made me laugh. It is pretty much the truth. The Legend of Heroes games are some of the most linear role-playing games in existence. It is kind of a turn off for most Westerners who are used to games like the World of Warcraft, etc. with huge, open, and free worlds to roam.
Anyway, I have seen this book as well. It is nice and all, but it could have been organized a little bit better as well as had some nice relationship charts to go along with it for all the main characters in the game. That probably would have filled up another couple hundred pages though.