I very much doubt it will be a well known actor. All of the actors you have listed are instantly recognisable household names in the UK, even if they're less famous in the US, and that's not Who's style.
I'd imagine they'll pick somebody we've never even heard of at this moment. Hopefully they'll pull back from the Smith mould and go back towards Ecclestone a bit, even though I like his style I'm losing my patience with all the mugging and wackyness.
I doubt it'll be Cumberbatch either, he's already a bit too famous, plus he's too associated with the human version of The Doctor: Sherlock Holmes. I've already noticed how Moffatt and Gattiss' writing for both shows have made the characters uncomfortably similar in parts, so it would just be weird.