I have a reservation for Cinderella's royal table for 8:15am. This is not an morning extra magic hour day though, will we be able to get to the MK via disney transport in time?
You will have plenty time. Disney transpertation will start running about 45 min prior to resturant opening so be at bus stop a little before 7:15am. The bus will say character breakfast and the most bus drivers will ask do you have an early ADR (I have never been checked just asked). I would not go any later I would hate to miss the first bus, the best part is walking in an empty park and having time to take pictures, not running to make your ADR time.