On the PHPClasses.org site today they've published the latest episode in their "Lately in PHP" podcast series, Episode #43 - "Is Facebook HHVM going to Replace Zend Engine in PHP 6".
The Facebook HipHop Virtual Machine, HHVM, has been evolving a lot, so PHP developers are considering it as a possible replacement for Zend Engine in PHP 6. This was one of the main topics discussed by Manuel Lemos and César Rodas in the episode 43 of the Lately in PHP podcast. They also discussed other topics like FastCGI support in HHVM, having PHP function naming consistency plans for PHP 6, TLS peer verification for secure connections, and using Composer to install JavaScript, CSS and images for PHP projects.
You can listen to this latest episode either through the in-page player, by downloading the mp3 or watching the live video recording from the Google Hangout.