By the use of media and marketing (a.k.a. propaganda). They will attempt to introduce "flat design" (along the lines of Microsoft "modern UI" and what Android already has -- therefore, following not competing; a practice that has been around lately regretfully in almost any industry) and pundits will start criticizing skeumorphic design all over the place in favor of (rather primitive looking, if you ask me) flat design (wait, that's already happening...). The herd will follow, the analysts will say "market embraced the 'improvements'".
But that's only for the software part; as for the hardware part, the usual will go on: change a bit here and there, minimize this and that, add at least (or exactly) one new feature that previous versions don't have. This isn't necessarily all that bad; the bad part is the gradual addition of features that could be there before or in one package (but, hey, that's business...).
Not this year, but probably soon: screen all over the front surface, no physical buttons (except maybe one power/sleep/standby at the side), wake up by means of touch-and-2-sec-hold on a part of the front surface (adjustable), eventually also incorporating fingerprint reader so that the device can only be woken up by the approved person (owner).