Rusty in the nicest possible way I knew it had to be you who'd start this thread! 
I hadn't seen the excitement yesterday so was gobsmacked to hear the news break around midnight. And I haven't been able to concentrate all day with thinking about it
I still think the most genius guess was LadyC (I think?) on the previous thread where she mentioned Zawe Ashton. If we were to get a female doctor she would be bloody perfect.
But let's face it, we're likely to get a bloke. BBC is teasing that it is someone who is working atm (or certainly recently), so that means some of the people we might think are ruled out, really aren't.
I noticed that Tom Ellis had pulled out of a show in the US recently and that pinged my radar. He's welsh, dark, can do brooding, so might be an option.
The odds on Daniel Rigby have shortened massively today. The odds on Matt Smith shortened massively in the 24 hours before he was announced so that might be an indicator this time around as well.
Richard Armitage always struck me as someone who could do an action/ darker doctor, if that's the way they want to take the character.
I would love it to be Chiwetel Ejiofor but accept that also is unlikely. And Ben Wishaw - there simply isn't enough of him on screen!!
I think Andrew Scott could be good too and Damien Molony. If Toby Whithouse was coming in as showrunner that would make a lot of sense.
I think Ben Daniels is this year's Paterson Joseph (as in widely discussed, widely tipped and possibly was seriously considered for the role). I would love that to be a misdirection, though, and he's actually down for the role of the Master or Omega!
Gah! Still going round in circles... 