Facebook is doing something similar, but instead of annotations they are breaking syntax compatibility (for the better, I think). This talk is unfortunately the

Facebook is doing something similar, but instead of annotations they are breaking syntax compatibility (for the better, I think). This talk is unfortunately the only reference i can find: http://www.infoq.com/presentations/php-history http://www.infoq.com/presentations/php-history relevant part starts around minute 22.