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Apple on Monday began seeding the OS X 10.8.4 beta to developers



From Apple Insider:
According to people familiar with the release notes, build number 12E27 doesn't show any changes in the areas on which developers should focus, suggesting the software contains bug fixes and small enhancements at this time.

Like the final OS X 10.8.3 betas, the first 10.8.4 seed asks testers to look at Wi-Fi, Graphics Drivers and Safari, while the seed comes with no known issues.
  Apple seeds first beta of OS X 10.8.4 to developers