OS X Mountain Lion 10.8.2 Supplemental Update 2 Released for 2012 Macs
Owners of 2012 model year Macs have a minor update available for OS X Mountain Lion. Labeled “OS X Mountain Lion 10.8.2 Supplemental Update 2.0”, the small system update resolves issues with Keychain that were specific to Macs released this year. No other issues are mentioned, and the update is unavailable to other Mac users. This Supplemental Update is not be confused with the general OS X 10.8.2 update released a few months prior, which was available for all Macs.
If your Mac is eligible for the update, you will find it available as a notification from Software Update shortly. You can also download it immediately from the Mac App Store, or get it directly from Apple.