The lone 58-inch model's focus remains on that 2560 x 1080p screen, whose stretchy 21:9 aspect ratio fits what you often see at the movie theater without having to crop or adjust like you would with a typical 16:9 set.
It'd be hugely valuable to have the entire bottom of the screen act as a trigger, so you can focus on what's downrange of the lens instead of how to direct your fingernail to land on the speck-of-a-button that'll trigger the shutter.
In order to gain a better grip on the app's appearance in the land of mobile desserts, it teamed up with Samsung to focus on a single screen, and a single screen resolution.