Initially planned for E3, it seems that KOEI Tecmo accidentally leaked via an unlisted YouTube video that Hyrule Warriors is coming to the Nintendo 3DS.
Based from what was show in the video, Hyrule Warriors will have new playable characters like Tetra and the King of Hyrule from The Legend of Zelda: The Wind Waker. Both of the new characters will be playable in the Wii U version via the 3DS game.