OS X Mountain Lion Developer Preview 3 Available for Dev Download
Apple has released OS X Mountain Lion Developer Preview 3 to those registered with the Mac Developer program. The new build comes as 12A178q and includes many bug fixes, though it still includes a fairly lengthy list of known issues and bugs. This is the third beta release of OS X Mountain Lion, which currently has a rough public release date of “Summer” .
Developers can download OS X Mountain Lion DP3 from the App Store, though logging in through the developer center is necessary in order to receive a redemption code.
Due to stability issues and future upgrade problems, Mountain Lion Developer Preview should not be the primary operating system on a Mac. Follow a guide to set up a dual boot system between OS X 10.8 Beta and the more stable OS X 10.7 build for best results.