php-fpm будет (возможно) интегрирован в PHP 5.4

Updates
Mar 17, 2010
Antony Dovgal says PHP-FPM will not be in PHP 5.3.3, but looks like PHP 5.4. Read here.

Dec 04, 2009
Antony Dovgal announces PHP-FPM has been put into a SVN branch in PHP core. This is an exciting development. It will be a while before it hits production status, but this is a great move for the future.

http://php-fpm.org/