With rumors of this year's "iPhone 7" largely looking like the iPhone 6/s, why not call the new iPhone this autumn the iPhone 6 SE? Then launch the iPhone 7 earlier than normal, say June 29th, 2017, 10 years to the day after the original iPhone launched? Hah. That would be epic!
I really want this 2017 iPhone. Reduce the bezels, especially on top and bottom. Build Touch ID into the display, and make some way to use 3D Touch as the physical home button. Then you could use OLED to always have a small, thin circle appear on the bottom of the display where they could tap to unlock. Hopefully find a way to combine a thin sapphire layer over a new generation of gorilla glass and make the whole thing scratch-resistant glass that is shatter-proof from at least 6 feet up, as well as waterproof. Then provide a wireless charger, or perhaps one that uses only a smart connector magnetically. So all ports would be gone, and docking or diagnostics could be done using the smart connector. Then there is probably a way they could use the glass surface as a speaker, as I've seen glass-pane speakers before. Then just use 3D Touch for buttons on the side of the glass, such as the sleep/wake button, volume buttons, etc. Perhaps if you do different gestures, such as squeeze the phone tightly on the sides it could make it sleep/wake. Then force-slide your finger down the side to change the volume.
That would be the ultimate iPhone: A beautifully engineered slab of glass that won't crack (well from most normal use), won't scratch, takes up a lot less space, has no visible ports or speakers, has no antenna bands because the whole thing is tough glass, no buttons, all beautiful display that has low reflectance and excellent brightness outdoors, but with all the same functionality of physical buttons and ports, and is completely sealed/waterproof. I doubt we'll get this far by 2017 but I can hope, lol, and I think 2019/2020 isn't out of the question. I think 2017 will be halfway there. 2019 or 2020 they'll remove the lightning port, maybe find a solution for the speakers, mic and side buttons, and probably shave off some more bezel as 2017 won't be close to all the way. 2017 will be all about that glass, no home button, reduced bezels, and if they don't do it this year—removed headphone jack. I just hope they're able to get the glass strong enough if they switch back to that because I hate having to use a case.