The video below [in the post] shows a visualization of activity in the book's Git repository since April 2010. During this timeframe we mostly worked on translating chapters from English to German and editing the chapters for the German edition followed by translating chapters from German to English and editing the English edition's chapters.

The visualization shows the work on the English translation all but stopped at its conclusion. As it stands, the book is scheduled to ship on May 10th, 2011 as Real-World Solutions for Developing High-Quality PHP Frameworks and Applications. You can pick up your copy over on Amazon if you'd like to reserve one before the shipping date.