While it is unclear what the compatibility update fixes, it is likely related to Apple's upcoming iOS 7 operating system, which has been available for developers since June 10.
iOS 7 introduces a number of design changes along with features like a revamped Notification Center and a new Control Panel. Apple's apps will likely get larger iOS 7 updates after the OS is released later this month.
While Apple is expected to feature iOS 7 during its September 10 iPhone event, the operating system will likely be provided to the public shortly before Apple’s new iPhones are released on September 20.
All three of the apps can be downloaded from the App Store for $4.99.
- iPhoto [Direct Link]
- iMovie [Direct Link]
- GarageBand [Direct Link]