Inside a document filed using the Korean Ip Privileges Information Service (KIPRIS), Samsung describes a multi-party business call software feature that may be found later on on future Samsung products, such as the approaching Galaxy S5.
As the documentation doesn't mention the Galaxy S5, it certainly is sensible to visualize that this type of calling feature is going to be on Samsung's approaching flagship mobile phone models should Samsung develop it. To begin with, we're clearly searching in a calling feature for Android products, thinking about the look renders presented within the document.
By what is shown in the app portrayed in the pictures you see, it would seem users will be able to use both the front and back camera at the same time when in a video call conference, while also being able to see the video feeds of others at the bottom of the screen. It's possible the feature might come as an update to ChatON, which already does allow one-way conference calls - the option to have multi-party calls would give Samsung a nice feature to boast about on its messaging app, though whether it debuts on the Galaxy S5 or through a software update to ChatON before that is something that remains to be seen.