I'm guessing they would put it on Star Fox. You've got the ships, tank, submarine, and could add a mech too if they really wanted. It even featured "precision" damage by way of attacking certain parts on enemies/bosses. They don't start out saying "Okay, what can we fit into an existing idea" they start with gameplay demos, and then in order to maximize profits they see if an existing IP fits within the gameplay. Kirby's Epic Yarn originally had Prince Puff as the lead without Kirby at all, Smash Bros didn't originally feature any Nintendo characters . They added the existing franchises to them because new IP's generally do not sell very well, especially when pushed up against their usual games.

Take Pikmin for instance. They had a tech demo for the Gamecube referred to as Mario 128 that featured 128 Marios  running around picking up blocks, rolling each other off the platform and so on. That sort of gameplay mechanic truely didn't fit into any of their current franchises (Mario, Zelda, Metroid, Donkey Kong, Kirby, Star Fox etc etc) so Miyamoto came up with a new idea. He is creating a new IP for the Wii U as we speak even. Granted, it probably won't be "mature" or "gritty" or anything like that, but it doesn't need to be. If people want that, they have every other platform you could think of to get their fix.

If you start out thinking "New IP" you end up with a more difficult development than if you start out with pure gameplay ideas. When Retro first became a part of Nintendo, they made several new IP's, but they all ended up being cancelled because they were half-inspired, low quality messes. Once Retro was able to put their full effort into Metroid Prime, they worked magic.

It is hard to do any sort of surprising at all anywhere, unless you decide to go new interface route like Nintendo has.  Nintendo has franchises for about everything gamers would want at this point.  And they do these franchises in new ways, utilizing the second screen.  An annoying aspect here is when Nintendo tries to do something different, out comes the complaining, "Don't want!"

Where are their major narrative based games? They've got competitive games for families and children to play on the couch with but where are they for them when they grow up? Kids don't need all the narrative in the world to play a game because their imaginations can amplify anything Nintendo creates. Nintendo creates a brand and sticks with it. They don't surprise with new IP's but redress their characters around the new consoles that they make with new gameplay styles. What has Nintendo come out with what people say, "Don't want!" I doubt it because they aren't even trying. They leave that up to third parties. They leave it up to aquisitions just like they did with Rare and now with Monolith. The day Rare left Nintendo was the day mature content on Nintendo consoles died for me.

The surprises have come from indy devs this gen some first party and major third party. Games like Mass Effect, Witcher 2, Journey, Unfinished Swan, Uncharted, Tall Tale games, and many other indy made games have set major standards.

So instead of answering simple questions you'd rather avoid it and then mock it....Claiming a game is original and then not being able to defend that claim is pretty attrotious dude. 

Gameplay mechanic - use the wii u pad as a console for a vehicle/mode of transport that involves numerous functions e.g. power, radar, ejection etc etc. 

Where can that be fitted into? Mario? Link, Brawl, Metroid? Nope. 
Also most of those are relatively child friendly so if the gameplay mechanic involved something serious e.g. precision damage, I doubt nintendo would ever want to make any of their IP's "mature" in that sense. They are limiting mechanics by saying that they want it to fit into an existing IP.

It's Nintendo. I loved the SNES and thought the N64 was brilliant. What I don't do however is mindlessly worship a company and unrealistically view any of their products and I'm not going to start to do so now. Nintendo admitted it sucks at core games, and those games tend to be mature in focus, ergo by sticking to it's own IP's Nintendo are limiting their options, not expanding them.