Just back from a few days off. The current target date for the Sierra Cascades Bicycle Route maps to be available for purchase is the first week of April. This project is our main priority right now. I am working on a webpage with more information about the route. I will post here to let you know when that is up.
Regarding Bil Paul's book, though the route is based on a lot of his routing, it is not always the same. As far as I know, Bil is not planning to update/reprint the book.