With the advancement of AI, I could see Nintendo really embracing that to experiment with it.
My pitch would be a new Legend of Zelda title. However, this is no ordinary "Zelda game". With the power of AI, your partner in the gameworld is Link, whom you can converse with intelligently with in game events or just
general banter.
Something like "Hey Link, there's a wizrobe near the tree". He responds with "I'm not feeling so hot right now, the food we cooked earlier was bad. Can you give me a health potion?". "I feel much better, I'll go deal with the wizrobe now!"
Or entering a Dungeon that's extremely dark. "Link, be careful. We have some wood sticks in our backpack, why don't you light them and then throw them into the darkness to help us navigate where we're going" and Link would
then carry out the task-lighting the sticks and throwing them down to help light the way while still talking with you about the situation in real time".
Hopefully one day we'll get something like that. I think it'd be really fucking cool to pull off. The Matrix demo with the AI NPC conversation mod is a prime example of bringing the game world to life.
Besides all that, I'm hoping their "gimmick" is the return of glasses free 3D. 2 Screens.