Just one week after the second beta seed of OS X 10.8.5 Mountain Lion, Apple has released OS X 10.8.5 build 12F17 to registered developers. There are no known issues, and the update is available to registered developers via the Mac Developer Center and Mac App Store Software Update.
Apple asks testers to focus on WiFi, Graphics, Wake from Sleep, PDF viewing and Accessibility, and Mobile Device Management during their testing. Apple has also been providing 10.8.5 beta updates to its retail staff for testing.