if u place it with the screen down the side starts to glow in a certain color if u missed a notification like a missed whatsapp could be green or a missed fb notification blue.
id MUCH rather have an edged acreen i barely use than those ugly huge and useless bezels of yes my current iPhone. its starting to look very dated
The better way to utilize that would have been just add a notification blinker to the iPhone 4/4S, like every other android device did at the time. If they add that to a curved display later then you KNOW they are running out of ideas.