Apple has published a new note on its developer portal this evening, announcing some upcoming changes to its App Store policy. Starting next year, all new App Store submissions must be built with the latest version of Xcode 5 and 'optimized for iOS 7.'
The new rule goes into effect on February 1, 2014, and applies to both new apps and updates. So that means that, after this date, any apps that are built on older versions of Xcode or that haven't been optimized for iOS 7 will be rejected from the App Store...