I don't know how much of this tweet is just accidental confusion, and how much is bad advertising.
EB Games Canada is advertising a special deal on both Wii U games and the Wii U itself. In the tweet above, you can see that the image itself doesn't show anything specifically related to the Wii U. Yes, we all know that Wii controllers and games work on the Wii U, so you could at least make some kind of argument there about the image making sense.
Then the confusion continues with the inclusion of DS games. Those aren't going to play on a Wii U at all! Yes, the Wii U has some DS games via Virtual Console, but we all know that's not what's being shown here.
This whole image leaves me confused. No matter how you look at it, at least one element is missing that would have it make sense. If this is a generic holiday image to go with the upcoming deals, then the Wii U should be included. That would have it make sense no matter what! Instead we get this image, and it leaves me scratching my head as to just how confused EB Games Canada is.