If there was ever any doubt that Grezzo are developing the Nintendo 3DS remake of The Legend of Zelda: Majora’s Mask, the Australian Classification board just confirmed that they are indeed involved.
A rating for the game lists Grezzo Co., Ltd. as the author of the 3DS release, with Nintendo listed as publisher. You may recall that Grezzo—founded by Koichi Ishii, formerly of Square Enix—also developed Ocarina of Time 3D and The Legend of Zelda: Four Swords Anniversary Edition for DSiWare.
The Legend of Zelda: Majora’s Mask 3D will be released this Spring. Producer Eiji Aonuma previously stated that the game has been in development since 2011.