There isn't much known about the game at the moment, but there are a lot of beautiful footage and screenshots of it. (futurebetagamer.com)
Very little is known about the game so far, however, more information and videos will be released in the very near future as the release date of the game comes closer. (mypotatogames.com)
If it's long - awaited, that must mean people already know about the game, right? (gonintendo.com)