This news could be interesting or mundane. Companies will often buy domains to protect brands and to be future-proof. Nintendo could simply be doing as such. On the other hand, it may relate to the upcoming and currently nameless side-scrolling 3DS Mario game. The most intriguing possibility is that it could be an unannounced title for the Wii U?
We will of course let you know the details as soon as they arrive. Until then, what do you think supermario4.com represents?