I'm guessing they simply want to hold back on really showing the game until it is closer to release. Maybe they feel that way people won't whine as much about the delay since it will be more obvious it's not close to done yet? They are adamant on confirming it will be on Wii U still, even if it's not exclusive. Even if it is multi platform with NX, I see no reason that would be what's stopping them from showing the Wii U version either. So all I can think is it has something to do with the way they want to market it. Don't show much until like 6 months out from release.