MacRumors forum member “iwayne” has noticed that iOS 10 offers an interesting software workaround for when the iPhone 7's non-moving Home button fails.
Should that ever happen to you, iOS 10 will instantly create a software-based Home button centered at the bottom of the screen.
Not unlike the AssistiveTouch accessibility feature that many iPhone owners in Asia use regularly over fear of breaking the physical Home button, iOS 10's new onscreen button could hint at how a bezel-less iPhone 8 might work without a physical Home button.