The most we've gotten of Project Treasure is a simple image. 

So what is significant about this?

Take a look at the character on the top left. 

Look familiar?

This is Kos-Mos from Xenosaga. Meaning this is either a new Xenosaga game(Doubtful), or it's a crossover game. If it's a crossover game exclusive to the Wii U, it's obvious Namco would like to take advantage of that by adding Nintendo characters. 

Just a small theory. Thoughts?

It's too early to say it. It looks like a generic female anime chin to me. If it had anything to do with Xenosaga, it would appear after the (possible?) remaster is either announced or released.

This was just a teaser though. If this is Kos Mos, which is very likely(That doesn't look like an anime chin, that looks like Kos-Mos' chin), then it pretty much confirms the remaster will be on Wii U, exclusive or not.

They look like Dead or Alive characters to me

Nintendo characters have made their way into nearly every Nintendo published game recently, even when the game has nothing to do with them, so it wouldn't be a surprise at all really.

Imagine Kylee Strutt and Sunshine Sieber in the same room.