The only "big" title in development for the Wii U is Zelda.
And they're mysteriously now refusing to show it and delayed it a year, which reeks of the exact same situation that happened with Twilight Princess. They would share TP media somewhat regularily and then we got a big block of radio slience on the game, and the next we saw it, ta-da it's suddenly a Wii game.
Star Fox, Pokken, SMT x Fire Emblem, Mario Tennis these are just farmed out projects that Nintendo is not developing internally, when Nintendo's lineup starts to become majority outsourced/farmed out projects, it's another tell tale sign that they're ending their involvement with a console.
GameCube's end cycle was the same story ... Star Fox Assault, Battallion Wars, Mario Strikers, Mario Party, Pokemon XD, Geist ... you may say, wow that's plenty of support, but actually none of these games were made internally by Nintendo's main studios.
It's also curious that Miyamoto would not specify a platform for Pikmin 4 either. I do think it'll probably be a Wii U game, because it'll be cheap to just add content to the existing Pikmin 3 engine, but why not say it's for the Wii U if that is the case? That also makes me go "hmmm".
