Literally nothing, assuming it was the only game I was interested in. I love my Wii U, but I got it at launch based on some pretty empty promises of "launch window" games, and I always regret not waiting for a price drop or a good bundle. Promises and assumptions won't get me to buy the NX--only a huge amount of games already on shelves will.
Not even Pikmin 4. And that's saying something.