just one message, just arrived:
http://php.net/archive/2013.php#id2013-03-21-1
PHP 5.5.0 beta1 available 21-Mar-2013
The PHP development team announces the release of the first beta of PHP 5.5.0. This release is the first to include the Zend OPCache. Please help our efforts to provide a stable PHP version and test this version carefully against several different applications, with Zend OPCache enabled and report any bug in the bug tracking system. THIS IS A DEVELOPMENT PREVIEW - DO NOT USE IT IN PRODUCTION!