Here's some info from their site:
As we’ve been mentioning over the past few months, we are releasing our first ever set of books, titled ON, IN, AT. Now it’s finally time to share the details about this project that we have been hard at work on for over a year!!! It’s a three-book set that chronicles different time periods over a year in our lives with writing and photographs: the 2008 US national tour, a joint writing session in New Orleans for the new album in the fall of 2008 and the 2009 Australian headlining tour.
The book set will only be available for purchase with the pre-order of Sainthood, and the pre-sale will begin on Sept 28th!"