Nintendo is making money off the Blue Ocean, not the demographics present at GDCm or even E3. They have no reason to showcase something, with a trailer, or otherwise, unless it appeals to the traditional demographic present at these shows.
In short, they have nothing to prove. Thus, no trailers, etc. needed. If its something they feel will wow people at GDC, they'll show it, otherwise they are content to be in the money-making room.







