I'm currently doing a very slow and thorough read through of the book to weed out the last of the typos, errors, and ambiguous statements in the book. Currently I'm about 2/3 of the way through the book, so it may be another couple of weeks from now that the book will be available for sale in print.
Afterwards, I plan on adding more videos and online traces to the website. A forum is also in the works, as soon as potential spam issues are worked out.
Of course, the book will remain free online now and after the book goes for sale.