What Sony and Microsoft seem to be ignoring in all of this is that the Wii U will come with the tablet controller in the box. To use their features you'll need either a nice touch screen phone or a R3000 vita? So the game companies are not going to build games based on purely touch experiences for these consoles because it's not guaranteed that people will have these accessories so they can only ever be "tag-ons" or "enhancements" whereas for the Wii U, the tablet can be fully integrated because every single Wii U will have one.
So in terms of the best touch-based experience the Wii U is already at an advantage, wether or not that translates to increased sales remains to be seen. Microsoft is also at more of an advantage because more people have phones, but they can never get too fancy graphically because they'll be playing to a hugely varied audience of phones. Sony's idea just sucks though, I mean look at how the sales of the vita have tanked, no one is going to buy a vita simply to add some touch features to a few ps3 games, the only ones who will benefit are those who buy both just as a matter of course.