According to an image on 4chan, Nintendo are working on two new Zelda title for 3DS. Their apparent names are Ice Prophecy & Fire Prophecy. Check the image below.
Back in November 2011 Eiji Aunoma confirmed that a new Zelda title was in the works for 3DS. There was no mention of two titles, but it has happened before when LoZ: Oracle of Ages and LoZ: Oracle of Seasons launched at the same time on the Gameboy Color.
As usual take this rumour with a pinch of salt as we cannot rule out the possibility of the image being a fake.