Apple has released Boot Camp 5 with the release of OS X Mountain Lion 10.8.3. Mac users can now easily switch between OS X and Windows 8 with Boot Camp 5. It'll provide you with all the drivers you need to run Windows on your Mac. One disadvantage of upgrading to Boot Camp 5 is that support for 32-bit versions of Windows has been removed. Now you simply can't install 32-bit versions of Windows 8, Windows 7, Vista and XP.
OS X 10.8.3 also adds several enhancements like Boot Camp now supports Macs with 3TB hard drives.
For detailed information about this update, please visit Apple Support.