The Clock Icon in iOS 7 has live watch hands by default. Those are implemented in
SBClockApplicationIcon is merely a subclass of
SBClockApplicationIconImageView as the icon image view class. The Clock app (MobileTimer.app) has a special key called
SBIconClass in its Info.plist, the value is
SBClockAppicationIcon. This sets the clock icon class to the live icon.