By correcting for perspective distortion, I come up with the following dimensions:
overall height:5.48 inches
overall width: 2.65 inches
display height: 4.09 inches
display width: 2.30 inches
display diagonal: 4.7 inches
Man I hope that's just a fan mock up. I can't believe Apple would make no attempt to reduce bezel or any other innovative techniques of utilizing a larger screen. That's just an iPhone zoomed in.