"The Magic Keyboard features USB-C pass-through charging, keeping the USB-C port on iPad Pro free for accessories including external drives and displays."
Doesn't really say how, but I guess we are assuming the smart pins.
They better have really updated it because last Gen did not get nearly enough juice through the smart pins to charge. (check feedback on logitech charging stand)
Also, are the magnets really so perfect that when attaching to the keyboard it will pull to exactly the correct location so those tiny pins are aligned?