I just checked IGN, and noticed they are releasing this on PSP also.. my guess is that the team producing it for PSP will also be the one who does for Wii.
I got this passage from an article on IGN.com
"It will be on all platforms, including the Wii, but it's not going to be exactly the same product, he said. "It's done by a different team, so it's a different approach, and will be created for the Wii population."
Just by seeing that "created for the Wii population" to me = railshooter with no depth... I HOPE I AM WRONG!!!
heres the link http://wii.ign.com/articles/106/1067869p1.html