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Apple on Wednesday supplied its developers with an updated version of OS X 10.8 Mountain Lion Developer Preview 3, the pre-release build of the forthcoming Mac operating system update.



From AppleInsider:
The software update is now available in the Mac App Store. People familiar with the latest build said it is identified as "12A206J."

Apple has reportedly informed developers that MacBook Pro model released in mid-2007 are not compatible with the new build. The issue is expected to be resolved with a future update.

People familiar with the build also said that an error occurs when using Fast User Switching, in which the desktop may appear white for several seconds. Problems are also said to remain with the share menu related to Mail and Twitter in the pre-release build.
  Apple issues developers new beta build of OS X 10.8 Mountain Lion