PHP 5.5 release is already being planned. The release manager was picked, the new features are decided and the release date is estimated. This one of the main topics discussed by Manuel Lemos and Ernani Joppert in episode 28 of the Lately in PHP podcast.
They also discussed the interpretation from VentureBeat that Zend is working on mobile version of PHP, using abstract symbol tables to optimize PHP further, and creating classes that provide APIs that are simpler for the users.
Now listen to the podcast, or watch the podcast video or read the transcript to learn more about these and other interesting topics of the PHP world.