Well for Japan and Europe Mario Kart is indeed out and i shall be purchasing my copy today if all goes well.
http://www.mariokartwii.com/showthread.php?t=938 - Information Thread
http://www.mariokartwii.com/showthread.php?t=3299 - Spoiler Information thread
Looks good right? I can't wait to get online and race with some of the best that the country and then the world has to offer =D