Koei Techmo has announced today with a trailer that a 3DS version of Hyrule Warriors is coming soon. No release date has been set, but it is rumored to showcase at E3 next week. The trailer is below.
Also for the 3DS version, two new characters have been added. Tetra and King Hyrule from the Windwaker game will be added as playable characters. They will also be transferable if you have the Wii U version of the game, which was released in September.
Source: The Verge, Anime News Network