Apple has issued the third developer beta for Mountain Lion. OS X v10.8.3 beta build (with 12D32 build number) was seeded to all registered developers on the Mac Dev Center. General consensus amongst the Dev community is that the beta build doesn’t bring any new features to the Mac.
Apple has advised developers to focus on certain areas such as AirPlay, AirPort, Game Center, Safari 6.0.2 and Graphics Drivers.
While OS X v10.8.3 has no official release scheduled yet, rumors suggest consumers will likely be waiting until next year.
OS X developers with an active account with Apple can log into to the Mac Dev Center and download it right now.