The book details use of the Trinket - an ATtiny85 breakout board from Adafruit Industries.
Here is the back and front cover. It has changed over the last few months, the title a bit, the cover definitely new and a departure from many Make books. Another departure is color - the inside is printed in color vs. black and white for most Getting Started books. This allows you to really see the wiring and the projects.
The source code and the illustrative pictures have been posted on GitHub at https://github.com/trinketbook/GettingStartedWithTrinket
If you would like to see the Adafruit "Ask an Engineer" webcast in which I join Limor "Ladyada" Fried and Phil Torrone talk about many things including the book, here is the video:
Please excuse my actions and the bags under my eyes! I had been awake for like 22 hours at that point and I need my beauty sleep after 16! Curse transatlantic flights!
The book is available in final release via ebook in ePub, Mobi, and/or PDF formats from O'Reilly at http://shop.oreilly.com/product/0636920031598.do or preorder the paperback from Amazon.com. It should be out by mid-October!