Apple has seeded the first beta of OS X Mountain Lion 10.8.4 to developers.
OS X Mountain Lion Update 10.8.4 is an update to OS X Mountain Lion 10.8.
Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary. You can install this update using the combo or delta manual update.
Known Issues - None
Focus Areas - Wi-Fi - Graphics Drivers - Safari
Developers can get the update from the link below...
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