The submitted artwork reveals a video calling application with multiple video feeds displayed at the bottom of the screen. Presumably, you will be able to tap a feed to maximize it. Notably, users will also be able to stream both the front and back cameras at the same time.
Group video calling is a much requested feature that Apple has yet to implement for its FaceTime video calling solution. It appears that Samsung is looking to beat Apple to the punch and could launch the feature on the Galaxy S5 or perhaps as an update to its ChatON application.
Take a look at the images below for more details...