Apple's next installment of the OS X operating system, called Mountain Lion (version 10.8), may be released as soon as July 25.
According to Mac Rumors, this exact date of release is based off of the fact that Apple retail stores will be conducting store updates the night of July 24. It speculates that these updates will include installations of OS X 10.8 Mountain Lion on all store Macs, as well as the addition of promotional information throughout the store.
OS X 10.8 Mountain Lion will be Apple's ninth operating system update in the OS X series (unless you count the public beta version "Kodiak," which would make this the 10th release).
Apple has priced OS X 10.8 Mountain Lion at $19.99 and it will be available for download in the Mac App Store.