... they regenerate 11 into 12 at the end of the 50th Anniversary, rather than in the Xmas special? What if the Xmas Special will actually feature Capaldi, and it's currently all under wraps? Someone I follow on twitter suggested this. Two things point to this: a) Matt Smith shaved his head to shoot a film. Yes of course he can wear a wig, but it seems strange that they didn't film the Xmas special str8 after The 50th. The only reason not to is that at that stage they didn't yet have a 12th Doctor for the regeneration scene, and they certainly don't need him at the same time. Tennant filmed his part of the Ecclestone regen scene months later as he hadn't been cast yet when Ecclestone Regenerated. b) Matt Smith filmed a video with him holding up cards and thanking the fans, from where he was shooting the film. It seemed very final, like he truly planned not to return. Unless somebody knows for a fact that Smith is yet to or currently filming the xmas special?