The Legend of Zelda: Ocarina of Time is my favorite game of all time, and believe it or not, Majora's Mask isn't far behind on the list. So as far as I'm concerned, the only game Nintendo needs to bring to the 3DS is a remake of the dark and twisted title that hit the Nintendo 64 back in 2000.
Despite the fact that the Big N has moved forward with a sequel to A Link to the Past instead of a Majora's Mask remake, Shigeru Miyamoto still has not ruled out the possibility of bringing both to the handheld. When asked by IGN if Majora's Mask fans "were out of luck," the Mario mastermind responded with a chuckle, "Well, they're still in my memory."
While this by no means confirms anything, there's still plenty of reason to have hope that we'll see Majora's Mask come to the 3DS in due time. I know I've got my fingers crossed.