If you check the Nintendo eShop from the Wii U home screen, on the Just Dance 4 game page there is an icon for DLC. But clicking on it will lead to an error code that says there is no content available.
EDIT: Currently there is no DLC for the Wii U version as of the last time I checked, which was yesterday. It was suppose to arrive sometime in December. --- GT/PSN/Nintendo Network ID: Dahvoo 3DS FC: 0946-2251-0734
I got this today from Gamefly and was disappointed there weren't any DLC songs. My girlfriend and I played all the tracks we liked and some of the others but we want more... --- Nintendo 3DS Friend Code: 0344-9609-8300 Nintendo Wii U ID: GIANTBOWSER