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An anonymous source has provided io9 an image which appears to be a video still grab (as the image appears to be interlaced).
We will avoid the spoiler information here. It does confirm at least one casting rumour we have reported on recently in Doctor Who: Podshock. It also confirms another casting/character rumour that has been long bandied about concerning the climax of the 2009 specials.
The article on io9 by Charlie Jane Anders also mentions the title of the one of the actors pictured and the character's wardrobe lends credence that the title may be true as well. If so, it opens up other possibilities and confirms what many have been conjuring over the last few years.