So muhc.
If I had to say only one thing I'm excited to see, it'd be what Nintendo will do with open world. It can be amazing if done right, but terrible if done wrong. If any of their franchises are built for that, it's Zelda. Nintendo's also known for being somewhat different from the competition when it comes to their games, so I hope that they do something in there that will really help evolve the open-world genre as a whole.