This was hidden in the Wii price drop press release below:

Wii ownership also opens an avenue for players to the industry’s most diverse and unique collection of home console games. Key upcoming releases include Wii Fit™ Plus, launching on Oct. 4, and the first truly multiplayer Mario™ title ever, New Super Mario Bros.™ Wii.

Both new and veteran players in America can jump into this new Mario action when it arrives on Nov. 15.