They need to introduce a brand new standard-bearing kick-ass design and redefine what the concept of a phone is supposed to look like. It needs to be sexy as hell
Don't be silly. It's a PHONE for chrissakes. What exactly do you want Apple to do to the form factor? Make it pink, glow in the dark, and cover it in feathers?
There is no "revolutionary redesign" to the smartphone form factor on the horizon. Not from Apple, not from anyone else. All the innovation will be in software and services.