I'd wager a lot of money that we will find out the launch date, line-up, and price on this day.
Nintendo is holding a Wii U press event in New York City on September 13. It will begin with a presentation hosted by Nintendo of America President Reggie Fils-Aime that will be focused on "learning more about how the Wii U will change the future of gaming and entertainment." There will be hands-on demos for the press following the presentation.
The event seems to be similar to the 3DS pre-release press event, which happened at the end of January 2011, roughly two months before the 3DS launch, and the Wii pre-release press event, which happened in mid-September 2006, roughly two months before the Wii launch.