When you get a moment everyone should go watch a replay on each of the new tracks in slow motion to get a grasp of just how much incidental detail Nintendo has stuffed into each one.
F-Zero, in particular, is stunning. I saw a flowing river, a desert area, Helipads and Biodomes on top of skyscrapers, jets flying in formation, a ringed moon, and all kinds of interesting buildings. Also a "Show me your moves" Captain Falcon billboard as well as rotating billboard featuring F-Zero ships.
Not only that, but the replay camera angles Nintendo chooses are inspired, brilliantly framing your character and the track itself with the background, and usually orienting the camera to gravity so that you can see just how upside-down you really are, which you can't tell while racing, obviously.
This game is ludicrously good. Makes me sad that this might be the all-time peak of MK. It might not get any better than this, it really mightn't.