Not sure, it is unfortunately a direct function of Zend's aptitude to stick to their own release date. We have to juggle our own desk time in function of the tools we require. We will have something usable definitely before October - 2.2 will remain the stable offering at that time as well - with Silverstar's closed Alpha/Beta/RC releases available to current clients.
Auracle will be launched right when the PHP5 encoder is released however, it will prove a strong addition to any business with a need for online support.
Cheers.
Alex