Do the buses start running at the resorts to be able to use them to get to MK & HS for the new Early Morning Magic? This is the new separately ticketed Early Morning Magic not the Extra Magic hour.
Yes, they will.
MK has had EMM for quite some time, and you can get there. Usually buses will start at around 6:30,so you should be fine. And if a bus doesn’t arrive, you have time to call Uber and name it in time.