With the recent release of iOS 7 GM to developers, it is not surprising that Apple has now been sending emails inviting them to submit their iOS 7 apps. With an official public release set for September 18, developers can finally submit their updated apps.
Along with the usual "improvements and bug fixes," many apps updated for iOS 7 will probably take into account the radical design change introduced by Apple's latest mobile Operating System.
Here is Apple's email to developers: