
Apple today released the third Yosemite public beta for beta testers, following the release of the second Yosemite public beta on August 21. Developer Preview 8 has also been released for developers, two weeks after the seventh Developer Preview was released.
The software update can be downloaded through the software update function of the Mac App Store, and developers can also download DP 8 from the Mac Developer Center.

Apple is expected to release OS X Yosemite to the general public later this year, possibly following an October event that may introduce new iPads.
Article Link: Apple Releases Third OS X Yosemite Public Beta, Developer Preview 8