Apple Seeds OS X 10.9.3 Beta 7
Apple today has seeded the seventh beta of OS X 10.9.3 to developers. This release comes a week after the sixth one. Developers who update to this beta won't see much new from the last one. Apple is still asking developers to focus their testing on graphics drivers, audio, mail, contacts, and calendar sync.
Developers can update to beta 7 in the Mac App Store > Updates > Software updates > OS X 10.9.3 seed 6. If you don’t have it yet you can download it for the first time from the Mac Developer Center.