The BBC have released the full list of episode titles for Series 9 ahead of the premiere on Saturday:
I love the titles for episodes 11 and 12 - "Heaven Sent" and "Hell Bent". Not to mention "Sleep No More" (Mark Gatiss) and "Face the Raven" (Sarah Dollard).
With every piece of information released, Series 9 just seems to get better and better.
You can read Steven Moffat's Exclusive Episode Guide over at the Radio Times.