Nintendo loves doing mall tours to promote their upcoming systems. We saw it happen with the Wii as well as the DS and 3DS. It should be no surprise that a rumor of the same thing for Wii U is making the rounds.
Sounds like Nintendo may have already started the manufacturing process on these kiosks for a Wii U mall tour. I'm guessing some official kiosks are going to be at E3 this year, so we'll have to see if these rumored mall tour kiosks match up. Thanks to Dim for the heads up!