Update - 6/11/13 : This was a hoax. Nintendo has revealed the real demos include Mario Kart 8, Super Mario 3D World, Donkey Kong Country: Tropical Freeze, and The Legend of Zelda: The Wind Waker HD.
Best Buy recently announced they would have demos of a handful of Wii U games that will be featured at E3 2013 this week. While the retailer hasn't said what titles will be available for consumers to try out, it appears someone has leaked the info.
The image you see above is a photo of an alleged poster sent to a local Best Buy store as part of the promotion. As you can see, the list of demos include New Super Luigi U, Pikmin 3, The Wonderful 101, and the HD version of The Legend of Zelda: The Wind Waker.
While many have voiced their skepticism about the authenticity of the poster, gamingvlog.net says that one of their sources has confirmed that it is indeed real. Seeing as how Best Buy's "Nintendo Experience" is scheduled to begin on June 12th, we'll know soon enough.