Apple has released a Golden Master version of its upcoming operating system, OS X 10.9 or Mavericks, to developers.
This essentially means that OS X 10.9 is finalized, as the Golden Master is the same version that will be released to the public. The exact date of launch has not yet been revealed, but Mavericks should become available sometime in October.
Named after a famous surfing location in California, Mavericks brings better performance and battery life, the ability to tag files, folders and documents, better support for multiple displays, a new version of Finder with support for tabs, a new version of Safari, as well as many other fixes and improvements.