I would love this to be true! This could be so much like the Wii remote: Totally simple but complex enough if needed. If the feedback of the on-screen buttons is anything like Apple's taptic engine it will feel great to play games on it.
A primary controller that has two buttons and can be used sideways like a Wii remote? This is Nintendo going for the mass market. Very interested if this is indeed true. Can't wait to learn more about it.