Fuck yeah! I'm in! This was the only hold up for me.
I got bad news for you:
That motion controls option was in the first preview build journalists saw last month. 99 percent sure the only thing it does is let you shake the right JoyCon to do melee attacks and Glory Kills. I played the game with the motion controls setting on and that's all it did.
https://www.youtube.com/watch?v=8ZqoNEZqXuc