In an interview with Ubisoft’s CEO, he had this to say about whether or not we should expect Ubisoft support on NX:
You can expect we’ll support Nintendo. Nintendo is one of the best partners in the world.
On Wii U and why they stopped supporting it:
We could see it wasn’t selling as fast as expected, so we reorganized around other platforms. With the Wii U, we were able to relaunch Rayman 2D. It was a good thing for the company and the brand and its fans. If you remember, it was supposed to be Wii U exclusive, but we made it multi-platform when we saw it wasn’t selling fast enough. The Wii U has done quite well. It’s still a Nintendo machine with lots of great franchises, and we’ve sold lots of copies of Just Dance on it.