Hopefully someone at Nintendo has gone to Miyamoto and told him he can't just make games based on his hobbies.
I'm very skeptical about this. IGN have a habit of pulling rumours out of nowhere. If Miyamoto has a big, new 'core' IP, then fantastic. Supposedly he was working on something new a couple of years ago that never popped out... All or nothing will be revealed at E3, I guess?