From David Whitehurst's blog:
The AppFuse Primer is published! And, you can order your copy today. It's been a long road getting this done, but I'm excited about it and I hope you will be too. Please visit the site and consider the purchase of a copy today at http://www.sourcebeat.com/books/appfuse.html.
For more information, see SourceBeat's Press Release.
This book is as up-to-date as you can get. While I hope to do another AppFuse release in the coming months, this book should be up-to-date for quite some time.