According to a scan of next month's Nintendo Power, the first original Mario platformer since 2002 (or longer, if you wish to discredit Super Mario Sunshine) will finally be released to the world on May 7th--since this was listed in an official US Nintendo magazine, we're willing to assume this is the American release date.
The new Super Mario Bros. for the DS will launch during the media frenzy we call E3, so any downtime we were hoping for has now completely vanished. Thanks, Nintendo, thanks a lot.