How does one view pictures fullscreen on iPhone 5? There is an annoyance in the iPhone 5 that the camera sensor is 4:3 but the phone display is 16:9. This makes photos not cover the entire screen.

Apple has now begun running a Thanksgiving commercial where they show the person viewing their photos and it takes up the whole screen of the phone.

Is there some setting configuration that I can change to display pictures fullscreen?

You can see the commercial here.
Double tap on the photo to make it full screen. Alternatively, you can see toward the end of the commercial, a simple swipe to the left or the right brings up subsequent photos full screen without the overlay of controls on the top or bottom.