The Golden Master seed of OS X Mountain Lion has been released to developers. Golden Master (GM) builds are typically the release version of software, indicating that a public version will arrive very soon. The GM build is 12A269 for Client and 12S302 for Server.
Registered developers can get a download code for Mountain Lion GM directly from Apple’s Dev Center, that code can be redeemed through the Mac App Store as usual. Developers can also download a new version of Xcode 4.4 development suite.
OS X Mountain Lion is versioned as Mac OS X 10.8, and includes over 200 new features, many of which are borrowed from iOS, including iMessage, Notification Center, Share Sheets, Game Center, Notes, Reminders, Dictation, and significantly enhanced iCloud integration.
Apple previously stated that OS X Mountain Lion would be released this July at a price of $19.99