http://www.nintendo.co.jp/wii/sx3j/index.htmlNintendo dropped this at a shareholder meeting today with no more information than what you see here. Genre is unknown, part of Nintendo developing it is unknown. Whether it will come out of Japan is unknown.

Rating is "C", Japan's pseudo-equivalent to the ESRB's Teen (C is 15+). Release is May 26, 2011 in Japan.
The mighty NeoGAF also discovered this:
http://www.neogaf.com/forum/showpost.php?p=25658064&postcount=15Those are quotes from the Book of Job in the Bible.
I am intrigued, and the release date being so soon means we should get more information before long. I am also saddened that so many things don't make it out of Japan and am afraid for this one.
Random anecdote, this is the same way they revealed Metroid: Other M. Website with one image and a piano song.

Edit: Apparently there was a different image up there before that showed her eyes, but they've since removed it for some reason. This is it:

April 5, 2011: Also, a video:
http://www.youtube.com/watch?v=-WUk7q5rJKw&feature=player_embedded