From Studio Walljump's Twitter:
"North American Release! March 14th!!! 500 Points!!! Liight! How can you say no? Don't answer that; just say yes!"
The game was expected for release mid-2010, but Nintendo's lotchecks pushed it a few times, and finally after a busy winter period, Nintendo accepted it.
Trailer: http://www.youtube.com/watch?v=o3CZK3F8qTk&feature=youtu....