Apple has launched another update to OS X Mavericks, but for now, it's only available to developers.
Dubbed OS X Update Seed 10.9.2, the prerelease update includes some minor tweaks to Mail and deeper integration of FaceTime audio into Messages and associated apps, according to 9to5Mac, which earlier reported on the update. Apple also asked developers to specifically focus their time on testing VPN, Graphics Drivers, and VoiceOver, according to a listing in the Mac App Store.
. It's not uncommon for a subsequent improvement to be in testing so soon after a public release of an earlier version. There's no telling right now how long it will take before 10.9.2 is made available to the public.