Apple recently released its almost completed version of OS X Mountain Lion to developers which means that the company is still on track for a public release of the newest Apple operating system by the end of July. Known as Gold Master, the release should be the final Mountain Lion build given to developers before the OS is available to users.
Apple still has yet to announce the actual, specific release date for the operating system, though many critics and analysts believe it will pop up within the next two or three weeks. Apple released OS X Lion to developers on July 1, 2011 and followed up with the consumer release on July 20. Whenever Mountain Lion is available, users will be able to upgrade for $20 through the Mac App Store, or for free if they bought a Mac on June 11.
OS X Mountain Lion