Do you know, if there are any plans to release PHP 5.4, or will PHP 6.0 be the next version?
Of those, it is looking like a 5.4 will come first. There was some discussion back in August about putting together an alpha release but relatively little chatter on that topic lately.
In the mean time, you can keep up-to-date with the latest additions and changes by installing the bleeding-edge development snapshots.
Just as an update, the most recent push towards an alpha of 5.4 is right now: for the discussion, follow http://thread.gmane.org/gmane.comp.php.devel/62998
Salathe, thanks for the information.