After watching this video it looks as though Ghost Squad for the Wii is exactly the same as the arcade version, the only new addition is some 4 player Point Blank style target shooting games, I’m not sure whether the 4 player mode has made it over to the mission part of the game. Also I’m hoping there will be some extra mission on top of the arcade ones but we will have to wait and see.
Also a preview of the game has just been posted up on Eurogamer, which doesn’t answer my above questions, but does give you a good insight in to how the game is being received by the consumer gaming press.