Apple has seeded developers with a pre-release version of Mountain Lion OS X 10.8.3.
- Safari 6.0.2 will not be offered to systems with 10.8.3 installed. Before installing 10.8.3 12D32, update to the latest Safari. - Software Update Preference contents may be shifted, especially with non-English localizations.
- After waking from sleep, some background graphics may draw in black or transparently.
- When switching between applications using Command+Tab, the icons may draw in black.
- Game Center
- Graphics Drivers
You can download the pre-release update from the link below...