Holy freaking balls, I'm loving the looks of the Flower Cup. Wuhu Loop looks like it follows the "Island Lap" from Wii Fit. I'VE JOGGED A MARIO KART COURSE. So cool. That'll be a fun course. Music Circuit looks ****ing magical... like Rainbow Road amounts of fun and wonder there (funder?). I'm SO psyched to finally drive karts through Peach's Castle in Mario Circuit. It'd be cooler if it was a little more like the interior from Super Mario 64, but I'll take it. I like that Rock Rock Mountain looks like it might take place in the same region as Wario Goldmine. That consistency between locations in different Mario Kart games is cool to me. Also at the very end there, notice that Mario kind of makes his glider-kart dive then pop back up... looks like it works a similarly to the Super Mario World's cape or Super Mario 64's wing cap... very interesting to see how deep the glider mechanics are.
The Banana Cup is looking good too. The biggest surprise, in a good way, is the fairly drastic remodel of Koppa Troopa Beach. A lot of the pointless ramps are removed, boost panels are added to them, and the karts' ability to dive looks fully utilized. On the flipside, it looks like they removed some palm trees, and added boost panels to the shortcut ramp... hopefully that's not the case--seems like that'd be a pretty huge gamebreaker if so.