Just got my install link.
EDIT: Controls SUCK.
Swipe to steer.
Auto-accel always.
Tap to use items.
Everything seems to like... level up with stats and stuff.
Appears to be a stamina system.
There's also gyro support in settings (tilt phone to steer).
"Emeralds" are used as loot box style purchase to get drivers, karts, wings, etc. Picking a certain rider, kart, glider combo will give you bonuses on a map. For example on Mario SNES stage, if you pick Mario, his kart, his glider, you can hold up to 3 items at a time. If you didn't pick boosted character, kart, glider, you'd be stuck with 1 item at a time.
Graphics are nice.