Downloaded an early E-copy of this today, it was sale for 4.99.
http://shop.oreilly.com/product/0636920028116.do?code=DRM2013
Its a very basic intro, and theres nothing more than what you'll find on the beaglbone web pages, or on the internet.. Might be useful if you've never worked with an embedded micro system, ever ever ever.
Glad it was only 4.99.. its probably about the right price.