Apple has seeded the eighth Developer Preview of OS X Mavericks to developers, nearly two weeks after the release of the seventh Developer Preview. 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.
Update: As noted by 9to5Mac, Developer Preview 8 includes an updated version of iTunes 11.1 that adds an option to turn off song change notifications. by macrumors