This is what I am trying to explain.
The Asymmetric one on the left is the one Emily claims. If the controllers were shaped like that, there is no way you can use them sideways like traditional controllers. (Going by the shape when you rotate it, the circle pad would be on the right if you have the flat edge facing down.)
What I am claiming, is that if they were still shaped that way. They would make sense as multiplayer controllers in Wii Remote style.
If you detach the right controller, that goes into your right hand, face buttons on top, circle pad on bottom.
If you detach the left controller and give it to someone, they will flip it around and hold it in their right hand because of the shape.
What would the position of the buttons be? Face buttons on top, circle pad on the bottom.
Hence, they would be symmetric in local 2P Wii Style multiplayer. Does this mean that the nunchuk could come back?
Edit: You may ask, why would the circle pads be on the bottom in that multiplayer mode? Because Wii Style controls were simple, you used the IR Pointer to aim at things, you have gyro to do that for you. Now I'm really wonder if the nunchuk would come back.