Chill your beans Dem, it's genuine.
Seeing as it's gonna be such a big event I'm not entirely sure what role they will play, hopefuly more than just a Hoax situation (2 scene's worth of footage) and it seem's there building up to the Great Inteligence being the villein of the special....but how does TGI fit in with The Big Bang and The Silence, if at all? I'm still waiting for all these questions to be answered!