I know I'm late with this, but I just saw it on Nintendo Press.  Anyway, the official press release: "Mario, Nintendo's iconic video game character, and Dr. Buzz Aldrin float in zero-gravity atmosphere to train for Mario's upcoming game set in space, Super Mario Galaxy for Wii on November 03, 2007 in Las Vegas, Nevada. The game is available in stores Monday, Nov. 12."

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Link: press.nintendo.com