Apple released 10.8.3 another major update with many performance fix with 3+ TB hard drives and airplay according to release note they fix many issues along with windows 8 bootcamp support
About OS X Mountain Lion Update v10.8.3 (Combo)
The 10.8.3 update is recommended for all OS X Mountain Lion users and includes features and fixes that improve the stability, compatibility, and security of your Mac, including the following:
- The ability to redeem iTunes gift cards in the Mac App Store using your Mac’s built-in camera
- Boot Camp support for installing Windows 8
- Boot Camp support for Macs with a 3TB hard drive
- A fix for an issue that could cause a file URL to quit apps unexpectedly
- A fix for an issue that may cause Logic Pro to become unresponsive when using certain plug-ins
- A fix for an issue that may cause audio to stutter on 2011 iMacs
- Includes Safari 6.0.3
if you want to update its better to clone all your hard drive before updating either you can update using inbuilt updater or download combo update from app site and install it manually