Shortly after releasing OS X 10.8.3 to the public, MacRumors reports that Apple has just begun seeding the first beta build of OS X 10.8.4 to members of its AppleSeed program. The build number comes in at 12E27, compared to the OS X 10.8.3 build number, which was 12D78.
Apple is asking developers to focus on WiFi, Graphics Drivers, and Safari. It’s unclear exactly what is included in the new update. The build will likely become available to paid OS X developers in the near future.
Update: Apple has now also released OS X 10.8.4 Beta 1 to registered developers. The update weighs in at 299.56MB for the delta version, or 824.4MB for the combo update, and is available now from the Mac Developer Center.