As is mentioned in this message to the php-dev mailing list from Derick Rethans, there's a desire to start on the next alpha release version for PHP - the 5.4.x series.

We're a bit further along now; and with the typehinting resolved (http://thread.gmane.org/gmane.comp.php.devel/62298/focus=62858) I want to start started with PHP 5.4 with the first alpha on Wednesday, November 24th. There are a few things that need sorting out and/or clarification: Annotations, Lemon rewrite, APC in trunk.

Keep in mind that this is only the very start of the process, so depending on any bumps along the way, PHP 5.4 may still be a bit out. Check the main PHP site for updates on betas and final releases as they become available.