For those who don't know what a Feel Screen is, its a touchscreen that can simulate textures. If there is a picture of sand on the screen, you can run your hand across the screen and it will actually simulate the tactile feeling of sand. Now this is a long shot, because I think to have this kind of cutting edge technology would drastically raise the cost of a Wii U, but Yoshinori Ono did say that some of the Wii U's unshown features were "unique possibilities that will be difficult to show". We learned this week a feature that we didn't know about, which was NFC, but that's pretty easy to show and its something thats not too unique anymore after Skylanders. As I recall when the Project Cafe rumors were flying around, there was a report that they may have this "Feel Screen" technology as seen here:
http://www.escapistmagazine.com/news/view/109722-Rumor-Ninten...
It fits in with Ono's description of "hard to show", and you can't show "feel" just like they couldn't show "3D".
And speaking of the 3DS, a miniaturized 3D screen that didn't require glasses was once thought to be a very expensive piece of groundbreaking technology that wouldn't produce reasonable prices for the system, but Nintendo found a way. Maybe Nintendo is doing the same thing here with a Feel Screen....
UPDATE 4/6/12
http://www.nintendolife.com/news/2012/04/rumour_vivitouch_to_...



