I haven't seen the latest Christmas special yet (it doesn't air so early in India, and my cable service provider decided to remove BBC Entertainment because apparently nobody but me watches it).
But that reminds me to ask Bekkler and Thought: you must have seen the "Asylum of Daleks" episode, right? Doesn't it eerily have similar concepts with Daleks to what we had in mind for Cybermen when planning our top secret "Endless Game"? By "eerily similar" it even had an equivalent to our Sherley!