1up is running a article titled, “Five Things You Didn’t Know About Thor: The Video Game.” Some of the stuff is already known, at least I already knew. But they have a few things I didn’t really know about. One of those things is having big boss battles, SEGA hinted that Thor will have a grapple ability to climb them and strike their weak points, like Shadow of the Colossus. It makes no sense to do this, since Mjolnir lets him fly.
As for the Wii version of the game, that version is being developed by Red Fly, who specialize in porting HD games to Wii. They did the port for Ghostbusters game and it didn’t turn out awful. The Wii version will also be more kid friendly, to go with what everyone assumes the Wii fanbase is and will have a more comic book like presentation. Yes, you will be able to swing your hammer with the wiimote.
The DS version is sounding the best. It will be developed by Wayforward (A Boy and his Blob and Contra IV) and will be a Contra like sprite arcade side scrolling game.