Ah, for that you'll have to wait until Saturday 3rd January at 5:35pm when it's going to be announced as part of the Doctor Who Confidential on BBC1. (BBC story)
But tomorrow may finally prove that you should always back Rich Johnston's predictions early at the bookies. He made his prediction for Paterson Joseph on October 13th:
"My last couple of Doctor Who leaks were fairly solid — Neil Gaiman to write 2010 “Doctor Who” and Tom Baker returning to the series proper in an unnamed role. Both have been bubbling under ever since. The next one is not so tied down. It’s still rather up in the air. But it’s quite a possibility.
The sixth series of “Doctor Who” (2011) will star Paterson Joseph as The Doctor.
Previously playing Roderick in the “Doctor Who” episodes “Bad Wolf”/”Parting Of Ways,” Joseph is known for fine upstanding and terribly-well-spoken-dontcha-know roles as Johnson in “Peep Show,” the Marquis De Carabas in “Neverwhere,” Space Marshall Clarke in “Hyperdrive,” Lyndon in “Green Wing”……and more importantly Benjamin in “Jekyll.” Written and produced by upcoming “Doctor” Who showrunner, Steven Moffat."
I imagine the odds would have been fantastic then, as opposed to todays 10-11 (bet £10 to win = £9 profit). I'll kick myself and promise to always listen early if Paterson Joseph is finally confirmed tomorrow.