First, Rob Doherty talked about the Super Bowl episode, Moriarty, and Irene Adler as part of the Television Critics Association's press tour.
From the article:
It was important to Doherty that the casting of Moriarty be kept secret for as long as possible. "We're approaching very carefully and as quietly as we can. At the end of the day, we want a tremendous actor," he said. "It's less fun for me if you know who he is."
It's Benedict Cumberbatch.
