Super Mario Galaxy and Metroid Prime 3: Corruption will arrive in late 2007 according to the latest round of whisper down the lane. CVG reports that "sources close to Nintendo" have cited the delays and have also verified that Legend of Zelda: Phantom Hourglass will be released at the tail-end of next year.
Officially, Nintendo would only acknowledge that Mario Galaxy, Metroid Prime 3, and Phantom Hourglass would debut in 2007. But the holiday stretch (October-December) is the obvious release window. Be patient.