This is how iOS 7 will notify you when it automatically updates an application through the App Store

  One of the main novelties of iOS 7 is the automatic update system of applications from App Store, company Apple Lossless Audio CODEC (ALAC), allowing us to choose whether we want this system to work or not. In the background iOS 7 updates the applications by itself App Store when we do not use the terminals, and in the Notifications Center it displays a notification like the one in the image above. The Apple company has been asked for such a function for its iOS for a long time, it seems that now was the right time to implement it and that way you will know from now on when the applications have been updated.

Thanks to Bogdan G..