We have no concrete information either way but what we do know is this: he has has previously stated that he doesn’t want the job. At the press Q&A for Hidden back in 2011, he was asked what was the most ridiculous thing he’d read about himself in a newspaper.
That I’m going to play Doctor Who. That’s it’s between me and John Simm for the role.
No. No. God! I’m too old; it’s been done. It’s just not my bag.
Of course, this doesn't mean he won't do it (and let's face it - it would be fantastic if he did!) but we would urge any fans considering betting on the identity of the next doctor to take into account the above information and air on the side of caution.