So i just saw info on this game for the first time.  It looks like the current gen versions all let you use a smartphone as a controller (last gen ones don't).  Is there any other game that does this and will this become a thing?  Maybe i'm just totally out of the loop but i haven't seen this happen before.

Huh, I didn't know that! Pretty interesting. I feel like this could become a thing in the future. Smartphones are so integrated into every aspect of our society at this point.

There is an IOS version of just dance called Just Dance Now that is pretty much the same thing using the Iphone as the controller. Nothing really new but for non-Wii/U versions this will help sell more since motion controllers are a hard sell now.