The announcement doesn't appear to be on PHP.net yet but a message was posted to PHP Internals [1] and the changelog is on pastebin [2].<p>If you want to give it a go, you can get fairly recent builds of PHP 5.4 for Debian / Ubuntu from <a href="http://apt.damz.org/" rel="nofollow">http://apt.damz.org/</a><p>[1] <a href="http://marc.info/?l=php-internals&m=131613589305249&w=4" rel="nofollow">http://marc.info/?l=php-internals&m=131613589305249&...</a><p>[2] <a href="http://pastebin.com/HKwbkJkz" rel="nofollow">http://pastebin.com/HKwbkJkz</a>