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Apple seeded build 12E47 of OS X 10.8.4 to developers



From MacRumors:
As with previous beta releases, Apple continues to ask developers to focus on Wi-Fi, Graphics Drivers, and Safari.

The update is available through the software update tool in the Mac App Store and Apple's Developer Page.
  OS X 10.8.4 Build 12E47 Seeded to Developers