What we saw last E3 is not a reflection of everything this console is able to offer. We have been trying the development kits and some of its new characteristics will improve its possibilities. It isn't something like Kinect or similar accessories, it's something different.
I can't tell you more about it because, if I do, Nintendo will send assassins to finish me! (laughs) But let’s say that Wii U will be a console with so many and unique possibilities that it will be difficult to show them in the box they are going to sell it or to be published by magazines and other mediums.
Check out the source link for the full article (in Spanish), which itself has a link to their own full interview.
Thanks for sending this in, Fernando!