Neither is these mind blowing tech. We have seen faster wifi and Bluetooth in almost every iPhone. I see these things as normal upgrades to the iPhone just to keep it modern. I am talking about something that makes people say wow. We have not had that for awhile now. That is not to say I am complaining, but at this point I don't care. I am just agreeing with the OP that Apple and the rest of the smartphone industry have rested on what they have. It seems consumers are ok with having a large upgrade every few years. Most are keeping their phones for much longer then a year, so the companies are waiting a bit to completely change the phone. This is the way I see it.
Consider that at some point the design of a device hits a functional peak. A point where it perfectly serves the purpose for which it is made. Sure we could see a five wheel car. And another manufacturer could put out a three wheel car. Do they work better than four wheels, no. An optimal point had been reach with four wheels.
I submit that we have reached such a point with our portable computing devices. To call them phones any more is silly. They are legitimately portable hand held computers. Incremental improvements is about all there is left to do.
Is there a better interface than touch screen? I can't think of any.
Will voice commands take over as the recognition and smarts becoming increasingly improved, sure.
Will size or shape change, larger, smaller, don't think so.
Will power consumption keep going down? Yes
Will new battery technology become a manufacturing reality in quantities of 100s of million units? Maybe
Is there a better shape? Round? Triangular? Or is a rectangle seem to fit what is functionally needed?
Going from keyboard based to screen input based and integrating phone, music player, texting device, note taker, video viewer, book reader, Internet connector, NSA locator and spy device, all into one pocketable package is not going to be repeated any time soon.
Next great step would be implants, devices we carry inside us, powered by body heat. But that's a few more years off I think.