No, the next gen phones will need twice the power anyway, so no change in size.
They will probably have real-time rendered 3D graphics in the user interface, and more expensive signal processing of their sensors, because of higher resolution of the sensors (especially regarding the camera resolution). And more sensors in total.
True anecdote from the early smartphone days: we were always having problems with rendering performance, but the next platform promised to have 4x faster CPU.
Later, it sunk in that the new screen had 5x as many pixels...
They will probably have real-time rendered 3D graphics in the user interface, and more expensive signal processing of their sensors, because of higher resolution of the sensors (especially regarding the camera resolution). And more sensors in total.
/s