Well...
It's not all copying.
There was BOUND to be a lot of similarities between the "sports" type games, and even in some of the party games.
But Sony also showed Socom 4. And Motion Fighter had a lot of things i haven't seen done on Wii yet. Examples - Spinning Punches + Head Lock.
While they are pretty similar now, you need to wait and see the full launch lineup, there are a lot of developers working on it...