According to SFCrowsnest, the identity of the twelth Doctor is to be revealed to an family based audiance during the Doctor Who Proms tonight (13th July).
Fantasy and science fiction writer Stephen Hunt has said that staff were gathered together and informed about a special segment during the prom, where the next actor to play the Doctor will be revealed. Stating that it was unclear as to whether they would simply name him or that the actor would actually appear on stage.
As they is no confirmation of this on the official BBC Doctor Who page, it is best to take this with a pinch of salt until it is officially announced.
The first of the special concerts will be broadcast live on BBC Radio 3, so tune in for all that Dr Who goodness. It starts Saturday 13th July 2013 at 7.30pm and is due to finish at approximately 9.45pm. If that’s a little late for you, BBC iPlayer users can catch the concert online for seven days afterwards.