PHP 5.6 released, from the release notes... with a quick glance, nothing major in most use cases but still worth the upgrade, especially since there are a few security fixes. Post memory usage down 300% (I like that), attachments larger than 2 gb, constant scalar expressions (I like that) and other constant goodies, php://input is reusable, unified default encoding, new variadic (variable parameters) functions syntax. phpdbg improvements and a many minor changes/bug fixes.
The full change log is at http://php.net/ChangeLog-5.php