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Apple has seeded build 12E52 of the upcoming maintenance update for OS X 10.8 with no known issues



The latest build's release notes once again ask developers to focus on Wi-Fi, Graphics Drivers and Safari.

Build 12E52 is the seventh release for OS X 10.8.4, and comes four versions a line of code was discovered pointing to Apple's ongoing efforts to introduce the 802.11ac Wi-Fi protocol in an upcoming Mac refresh.
  Apple seeds OS X 10.8.4 beta build 12E52 to developers