In a nutshell, having a full wrap-around screen would translate to a smartphone that does not come with any bezel at all, leaving you with all the more areas to touch, not to mention a truly peerless viewing experience. This particular rumor hails from supply chain sources, and who better than them to come up with dirty little secrets from the belly of the mobile industry?
It has also been mentioned that the prototype is currently being tested, where it intends to study the feasibility of doing away with physical buttons such as the lock/power key, using virtual keys that are shown off on the screen which have been extended over to the side. One does wonder, though, when the device is truly out of juice, how then, can one access the virtual lock/power key?