No, the Teselecta was always part of the fixed time in history, that's the beauty of it. What happened at Lake Silencio always happened. Just that we didn't know the full story until he told us. Even the first time we saw it in The Impossible Astronaut, that was the Teselecta. The fixed point in time was everyone thinking they'd killed the Doctor but it actually being the Teselecta.
And yup, the original stuff is awesome; I grew up on re-runs of Pertwee and (Tom) Baker :D Oddly enough, the Hartnell/Troughton era isn't actually shown all that often here in the UK even on the 'Dave' channel (which is basically a channel born out of buying up broadcast rights to most of the BBC's back catalogue)
As far as the Christmas special goes, I still want to see the bit mentioned at the end of The Big Bang - where he answers the phone and it's a king or queen on board the Oriental Express, in space, with an Egyptian Goddess on the loose. I'm hoping that's going to be this year's Christmas special (after all, we've had an Agatha Christie based episode, we've also had something on board the starship Titanic, so something on board a space-bound Oriental Express is not out of the question)
