Hyrule Warriors Legends is a port of the original Hyrule Warriors game for the Wii U with some extra features such as the ability to switch characters in the middle of the game, and additional characters such as Wind Waker's Tetra and the King of Hyrule.
Hyrule Warriors Legends is coming from the 3DS this March 25, 2016.
[Source: Nintendo, Kotaku, GameXplain (for the video)]