Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Well if they finally decide to drop the number and introduce the "Pro" name...maybe they'll finally have the 5.5 model be the Pro and smaller 4.7 be iPhone Air. I remember Apple was rumored to go this route a couple of years ago
 
My prediction: Every iPhone from 2017 will be called the iPhone X.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.