Following on from The Day of the Doctor, the Dr. Who 50th Anniversary special, which aired this weekend, comes Matt Smith’s swan-song in the Christmas Special, The Time of the Doctor. @bbcdoctorwho announced the news and title over on Twitter, including poster art, showing Smith holding a severed head of a Cyberman, as Clara, played by Jenna Coleman, looks on. Meanwhile, in the background, we clearly see members of The Silence as the church clock tower shows midnight has struck. All very portentous! The poster and title already have the internet abuzz with theory and gossip about what the up-coming special will feature; well, other than the demise of Matt Smith’s Doctor. Whether he regenerates as Peter Capaldi remains to be seen. Given, as…