Apple Seeds OS X Mountain Lion 10.8.5 Build 12F17 to Developers
Apple has issued OS X 10.8.5 build 12F17 to registered developers.
The new build is number 12F17 and has no known issues. Focus areas in included Wi-Fi, Graphics, Wake from Sleep, PDF viewing and Accessibility, and Mobile Device Management.
Developers can grab the update at the link below.