Err, no motion sensing, no. But still, if Nintendo can steal the form of a Dreamcast controller proptype, then Sony is perfectfully justified in borrowing motion sensing from Nintendo. Everybody borrows from one another, is the point I'm trying to get across.
In conclusion, get a ps3 instead of a Wii. You may think it's too expensive, but, actually, it's too cheap. The PS3, I mean. The Wii is too expensive.