With a new console comes a new controller and so far almost every PS4 topic is about the console it self. But the controller is a compulsory part of the gaming system which you will use for just as long as the console (The exception to this being the Kinect).
Nintendo's entire strategy next gen is to sell the console by offering a controller with a built in screen.
Some people even stop using consoles because they don't like the way the controller is built or how it works.
So what features do you want the PS4 to have?
Do you want the shape/ Style to remain the same/ similar?
How much do you think a new one should cost? (Controllers this gen vary between £25-£35 brand new).
That said the PS4 isn't confirmed yet so for all we know of it may not be happening. (Ignoring the rumours and the chances of it actually happening)