Apple is releasing a bunch of updates for the apps (Remote, iTunes U, Find My Friends, Find My iPhone and iBooks) to take advantage for the retina display and issue other bug fixes.
iTunes 10.6 adds the ability to play 1080p HD movies and TV shows from the iTunes Store.
This release also includes many improvements for iTunes Match, including:
• Improved song matching
• Improved album artwork handling, downloading, and display
• Addresses an issue where songs may skip when playing from iCloud
Available via Apple’s iTunes download page or via Software Update