Apple released Mac OS X 10.6.4 Update iMac (Mid 2010) for its just announced new iMac models Tuesday afternoon. The update includes patches that were previously released as part of Mac OS X 10.6.4 along with special fixes for the new iMacs.
The update fixes compatibility and performance-related graphics issues, improves compatibility with SDXC memory cards, and adds support for the new Magic Trackpad that was also introduced today.
Mac OS X 10.6.4 Update iMac (Mid 2010) is available as a free download at the Apple Support Web site.