When Nintendo released the 3DS, it was able to bring 3D to the masses, without the need of special glasses and really expensive hardware.
According to a patent recently published, they might be doing the same for the Wii U, where they would bring 3D effects to a normal 2D television, here is a quote from the patent:
A method for providing three-dimensional (3D) display on a display device, the method comprising: tracking the position and/or orientation of at least a part of a user; using a computer processor, determining a viewpoint relative to the display device based at least in part on said tracking; the computer processor using said determined viewpoint relative to the display device and at least one 3D virtual object modeled using real world coordinates to at least in part define the projection of the at least one 3D virtual object, including changing the viewing frustum for the projection of said at least one 3D virtual object in response to said tracking to introduce parallax for viewing the at least one 3D virtual object; and rendering for display, on said display device, said at least one 3D virtual object.
You can view the full patent here:
EYE TRACKING ENABLING 3D VIEWING ON CONVENTIONAL 2D DISPLAY
Nintendo Enthusiast points out that something similar was created back in 2007 by a modder, you can view a video of that here:
If you want to buy a Wii U, click the link below:
Nintendo Wii U Console – 32GB Black Deluxe Set