This was hotly anticipated and it lived up to all expectations and more. I'm going to list a few random things I liked a lot since there's so much to like here to begin with:
* That nervous bounce animation they do in front of the computer
* Dunkey poster. Dunkey yoshi.
* The hilarious yet extremely high quality character models, great 3d modelers on this team
* The saxophone mario kart song cover. It's a meme but it's also beautiful
* Full physics mario kart. I think you're onto something there. Rocket League meets MarioKart could be big