Look at the author's name. Look at the children and think of who they resemble. Notice how there is a woman, a hound, and a fall. Thank you Moffat for alluding to Sherlock because i totally needed that...yeah
Peter Capaldi's 'Wonderful, but Different' - Jenna Coleman. "Don’t be fooled by age, age is but a number. You will see what I mean!’ ‘The strange thing is, I have filmed my first scene with him and the first thing we did was the regeneration and I was looking him in the eyes and I had no idea what he was going to do and vice versa. But I could just feel he had definitely arrived and I have no shadow of a doubt he is going to be wonderful but different."