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Apple has seeded the eighth Developer Preview of OS X Mavericks to developers



From MacRumors:
Registered developers can receive the update via the Software Update tool in the Mac App Store. OS X Mavericks, which is expected to be released this fall, includes multiple new features like a tabbed Finder, full screen dual monitor capabilities, Safari improvements, and a new Maps app. Apple is reportedly targeting a late October launch for OS X Mavericks.
  Apple Releases OS X Mavericks Developer Preview 8