An interesting use of Mary, who in the books is said to be dead by the time Sherlock returns from faking his death. As she never existed in this version (as Mary), that sort of works. I predict that she and the child will die in the next few episodes . . .
I remember thinking that Moriarty's death was a bit of a shame considering what a challenge he was for Sherlock. It will be interesting to see how they handle that. And Rupert Murdoch the super villain - I love it!