For those who haven't seen the teaser trailer, you can view it here.
I don't know much else about the game aside from what the trailer revealed. Obviously, "Hyrule Warriors" isn't the official name. On Nintendo Direct, they mentioned that this is a spin off the franchise and isn't the game that they had mentioned earlier.
To me, it kind of looks like a game like Link's Crossbow Training only with fencing. I obviously won't be buying it right as it comes out because I don't have the money for a Wii-U, unfortunately. But nonetheless, let's discuss, shall we?