This looks really cool idea. as of right now I would love to buy this. But I think I will not buy it day one since I don't really trust the Warriors team to make a great Zelda story.
I am pretty sure the Zelda team has heavy influence over the story for this game, to the point that it could be argued as being canon to BotW (we will see about that one). The first Hyrule Warriors was pretty much just KT making a Warriors game with the IP. But it was stated that they are working closely with Nintendo and the Zelda team this time around.