Apple recently released another seed for OS X 10.8.3, Build 12D50, to developers in the Mac Dev Center. This is the fourth seed since the original 10.8.3 beta which was originally released back in November. Those of you who have a developer account and want to see what’s new in 10.8.3 can log in to the developer center and download the beta seed right now.

The notes for the current build state that the focus areas for this beta seed are AirPlay, AirPort, Game Center, Graphics Drivers, and Safari. After testing the new seed with different applications, developers are being asked to file bug reports with Apple. This in turn will allow Apple to make changes and fix any issues that may still be in the OS X operating system, progressing towards a more finalized iteration for the update.

Source: Apple Developer Center