updated 04:52 pm EST, Thu December 19, 2013
Public release timing remains unclear
[Updated with more details] Apple has released the first OS X 10.9.2 beta build, enabling registered developers to begin testing the update ahead of public availability. The build arrives just a few days after Apple began distributing the release version of Mavericks 10.9.1, which brought changes to the Mail client and a number of bug fixes. The new release is the first to bring FaceTime audio to the Messages and FaceTime programs for the Mac.
FaceTime audio on Macs in 10.9.2
The company has yet to fully detail any enhancements or bug fixes in v10.9.2, however developers have been asked to focus on Mail, Messages, virtual private network (VPN) features, graphics drivers and VoiceOver, according to an AppleInsider report. The update also features further tweaks to Mail as part of an ongoing effort to clean up bugs and problems with Gmail interaction.
The OS X 10.9.2 beta, referred to as build 13C32, can be downloaded through Apple's developer channel.