Apologies for posting something this misleading. Can a mod please Edit/Lock?
The original story is reported by Spanish website Planetapixel.es
The above image is a screenshot of Spanish website Xtralife, who have just listed Majora's Mask 3D for sale--24 hours before a 3DS Nintendo Direct. There's the possibility that they're just speculating, but remember that leaks have occurred this way before--remember Donkey Kong Country Returns 3d? We could very well be seeing an official announcement tomorrow. If you click the image, the index just reloads; this could mean that while MM3D is in their system, the page isn't yet live. Suddenly, tomorrow's Nintendo Direct got a lot more interesting.
My take: Majora's Mask has the best story, the most demonic and frightening villain and the most emotive experience of all the Zelda games. Its not the best but its a stunning experience without peer and simply hasn't been played by enough people. I'll be thrilled if this is true.