Enterbrain.co.jp has published an image (with content information and a release date) of the next Zero 3 Guidebook (in Japanese).

The only issue is that it's listed title is the SAME as the old one. So if you're a crazy fan (like me) and must have the book. Look it up by th ISBN number: ISBN4-7577-2499-3.The book is scheduled to be available for sale on October 7th 2005 a a price of 1,680 yen. (A little less than $20 US)

Thanks to Beyond the Camera's Lens for this!