Here's a BBC post with some speculation:
http://www.bbc.co.uk/news/entertainment-arts-23537948
Of the people on that page, I think Chiwetel Ejiofor would be best--although having Rose Tyler as the Doctor would certainly get points for strangeness.
I've noticed that they've been going with younger and younger actors, and if they continue that trend it would rule out either Patrick Stewart or John Hurt (I think Anthony Head would also be a good choice).
Incidentally, given the way John Hurt was introduced, I sort of thought he will turn out to be the Valeyard...
http://www.bbc.co.uk/news/entertainment-arts-23537948
Of the people on that page, I think Chiwetel Ejiofor would be best--although having Rose Tyler as the Doctor would certainly get points for strangeness.
I've noticed that they've been going with younger and younger actors, and if they continue that trend it would rule out either Patrick Stewart or John Hurt (I think Anthony Head would also be a good choice).
Incidentally, given the way John Hurt was introduced, I sort of thought he will turn out to be the Valeyard...