So, about that controller...
The Wii U controller, which contains a seemingly normal controller with a 6.2-inch touch screen in the middle, feels great. The way it grips into your hands is comfortable, and the way it is laid out is wonderful. For its size, it is surprisingly lightweight. The screen is nice. I can't speak to the tech nature of it, but the touch screen didn't smudge at all from having my greasy fingers all over it.
The two analog sticks are Circle Pads that are similar to the one on the 3DS. The triggers all mold to your hand nicely, and have a nice click to them. The D-pad and face buttons feel similar to the ones found on some forms on the DS systems.
The controller also features a Home button, a plus button, and a minus button, in a similar position as on the 3DS, but they look and feel similar to the ones on Wii Remote. There is also a microphone and speakers at the bottom. A headphone jack resides on top of the controller, and you can also adjust the volume of the speakers up there, too. An IR port, similar to the one on the 3DS, is also nearby.
In the various demos, the controller felt wonderful. I can't stress that enough. Pay attention to our more specific impressions for details on how those all felt. After playing with the controller, I look forward to checking out full games on this thing. It's supremely intriguing and cool.