The new date is 2/10/2008, to be exact.
Though widely expected after the release date was changed to "TBD" on the official Smash Bros. website and the Japanese launch was pushed to January 24, today Nintendo of America has confirmed that Super Smash Bros. Brawl has a new release date of February 10, 2008. As of this time, we do not have any details on the reason for the delay from the original December 3 date or why the North American version is lagging weeks after the Japanese one.