The footage I've seen looks pretty good, and I like the idea of the ghost spotpassing. Let me know what you think compared to the other Karts!
So far I like it. I'd compare it to Mario Kart Wii gameplay-wise, with the super-useful bottom screen from DS, though it does have an element from Super (the coins!).
There's 3 new power-ups. The raccoon tail is useful for defense and grabbing coins. The fire flower just... kicks ass... imagine... rapid-fire medium/short-range green shells. And the "7" power-up which gives you 7 items circling around you... some say chosen at random, but I wouldn't know since I only got it once.
I like most of the new tracks, with a couple exceptions (Music Park, Wuhu Loop), and the retro tracks are all very well remade. Can't say what my favorites are yet since I'm just in 50cc for now.
The gliding and underwater driving are nice, as they add more possibilities in level designed (some old tracks were modified with new underwater areas). The gliding in particular is fun, with some parts where you can take small shortcuts by flying over curves.