Darwinianevolution on 16 May 2016
The only gimmick that Nintend can pull off succesfully is the shared library between home console and handheld, so I'm betting for it. A handheld as powerful as the WiiU and a home console around XBGone power could easily do the trick there. Anything but that will be ignored by people, specially after the gamepad and the 3D stuff.
