But I don't think it means the doctor will regenarate
당신 see in RTS's book it says that the doctor meats the doctor (I think that means future doctor) and then becomes his companion thats why it's called the 다음 doctor, even though the doctor doesn't regenerate we see what the 다음 doctor will look like
So to 덮개, 랩 it up the 제목 "The 다음 Doctor" doesn't mean that the doctor will regenerate it means that we see what the doctor will look like after hi regeneration which will be in a future episode