Hollywood said:
Nintendo is experimenting too much with controls, I think. An input device is an input device. Just because they make a new way of playing games doesn't mean it's better or easier to play.
Come on. That thinking is totally 'inside the box.' The current standards for controls have you brainwashed. There are tons of ways to control a game. Look at all the methods we've had so far: joystick, d-pad, analog stick, light gun, keyboard, mouse, touchscreen, tilt sensor, dance mat, camera, microphone, etc. Saying one way is the best is purely subjective. Certain controls imply specific kinds of games. New kinds of games can be made, and surely there are new ways and combinations for controls that can be made.
I like the mock-up that paul777 posted because I've also thought of the idea of separating each side of the controller and having a sensor in each side (I was thinking tilt). But I don't think that's what Nintendo will do, as it's not really that different from what they have, nor revolutionary.
Perhaps the controller they make will have all the functionality of industry standard controllers without the same design, and thus ports will be quite possible. Perhaps they will put more or all of our fingers to use. Maybe they really will implement touch gaming into the controller, most likely with a graphics tablet (cheaper than a touchscreen I'd assume). Maybe it will involve how you move the middle of the controller, bending or twisting it in different directions (I believe there are PC controllers with similar ideas). I bet anything it will have voice input because it seems pretty cheap versatile, allowing both voice command, music input, clapping and tapping.
Of course, like with Nintendo DS, it's all about games that put the controls to use and you never know how that will pan out. I'm just saying that current controller standards are not a perfect concept in any way and games can allow much more.