It sounds like most games that are designed solely for the Wii will remain that way. Even with Sony's motion sensors, I sincerely doubt many games, if any, will be able to port over well. You never know though.
Maybe on games that would likely experience multiplatform success, the developers will put in a little extra elbow grease. But the way things are, I don't see the PS3 clique drooling over this.
I have a feeling the clique Ritz mentioned will be jumping ship to the X360 anyway seeing that that console also offers EA-sports and now GTA4 only at a much lower price.