real time app icon like iOS 7 clock
Apple always had some cool private APIs which we developers aren't allowed to use in production Apps, the animated App-Icon is one of them. Most of the time it's to save the experience for the user. Imagine every App uses an auto-updating Icon. The battery-life would go down and it would be a mess on the homescreen when everything is moving and blinking.
I think there is no way for developers to use this with Apple Public API as what i think you leave the home screen with moving icons on all the time as This kind of thing may kills batteries very fast as Moving clock icon needs to update every second. I really wish they'd implement this for us to use with nice way.