Re: First Look At Xmas Episode
It's Moffat so take with the usual bag of salt but some potential spoilers for the episode here:
So Yay for him remembering that "silence will fall" originally refered to silence actually falling but Boo for us never finding out who blew up the TARDIS.
I thought it was fairly obvious that it was the Order of the Silence, attempting to hijack the TARDIS in order to prevent the Doctor from traveling to the Fields of Trenzalore and answering the question, "Doctor who?".
"Every line of serious work that I have written since 1936 has been written, directly or indirectly, against totalitarianism and for democratic Socialism, as I understand it." - George Orwell, 1946