From the Associated Press:
Associated Press said:"In terms of NX, there's an idea that we're working on," said "Super Mario" and "Donkey Kong" creator Shigeru Miyamoto through a Japanese translator. "That's why we can't share anything at this point, and I don't want to comment on the other companies. If it was just a matter of following advancements in technology, things would be coming out a lot quicker."