There are multiple books coming out on the horizon from Falcom.
Nayuta no Kiseki Complete Guide and Visual Compilation (ED: Yes, this is a second one)
Product Number: B79
Pages: B5 / 208 pages
Release Date: 7/26/2012
Price: 1800 yen
(No cover yet)
The Legend of Heroes Zero no Kiseki (1) – Golden Sun, Silver Moon
Release Date: 8/20/2012
Price: 693 yen
The first volume of the novelization is being written by Kashika, and illustrated by Enami Katsumi.