If you haven't seen The Waters Of Mars, do not read ahead. Massive Christmas spoilers and the like.

Well, wasn't that something else?

The Doctor thought he was victorious, Adelaide shot herself and he began the slow realisation that death was coming his way. In forty days time, we will see the first part of The End Of Time, the story that will usher out the Tenth Doctor and judging by the trailer, it won't be pleasant.
Friends Reunited: Wilfred Mott (Bernard Cribbins) meets The Doctor (David Tennant)and learns that his hero is going to die. Having Wilfred as the main companion for the finale is a stroke of genius. I can't think of a more deserving candidate. Oh, wait a minute.
She Has Returned: Did anyone really think for a second that Donna Noble (Catherine Tate) wouldn't show up in the finale? She's rumoured not to be the only one reappearing but outside of Wilfred, I'm pretty sure her role is rather crucial. If that phone call is anything to go by, then it looks like Donna's getting a trip down memory lane.

My Name Is: The Master (John Simm). No smart suits or sleak brown hair. A dark blond look and hoodies, almost like a male Rose. Kidding! It will be interesting to see exactly what he's got in store for the universe. It's been rumoured that the Time Lords are returning in these specials. Would certainly be thematic for The Doctor.

Bad Dreams: Ood Sigma is definitely the harbinger of death. His role in these specials seems to be warning The Doctor of imminent regeneration as more spoilerish photos back at the start of the year have shown. Here he looks like he's in a white robe.

The End Of Time Trailer: http://www.youtube.com/watch?v=hfIcmcWcZxE