According to Nintendo, New Super Mario Wii offers a "new way to play Mario Bros that's never been done before." 

The all new Super Mario Bros for Wii include four player multiplayer. It's a competitive multiplayer Mario game, where players run through the classic style levels, fighting each other for coins and powerups. 

Nintendo demoed the four player mode, with Cammie Dunaway and three other Nintendo employees. 

Players can jump on each other, shoot each other with fireballs and other attacks. Item boxes generally produce one item per character. Killed players reappear in bubbles and players can free them, or leave them stuck for a while. One of the new powerups is the Propeller Suit, a jump suit that has a helmet with a propeller. Shaking the Wii-remote will let players fly in the air. 

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http://wii.ign.com/articles/989/989314p1.html

Dear theSchoenrock,

Buy this.

Sincerely,

Andross.

P.S. I Hate you,