SystemSoft Alpha Co. are releasing Moe Moe Daisensou: Gendaib-an 3D for the 3DS. Source:
Siliconera
Homepage:
http://www.ss-alpha.co.jp/products/moegd_3ds/
For people who don't have a 3DS yet and are considering to get Zelda OoT 3D, nintendo will be releasing a limited edition 3DS soonish. Source
Nintendo Europe