It was on just now. Not a self-contained story this time, it was the opening scene from the Christmas special.
Interesting points: Spoiler
We find out why Ood Sigma was there. Someone or something has accelerated the Ood mind-collective thing into becoming a time-travelling civilization in just 100 years, and they want the Doctor there because... they have been having bad dreams?
Looks like they set up some leeway for the online series and novels - the Doctor's been travelling a lot since Waters of Mars.
If this is supposed to be a teaser, though, it falls pretty flat. It's just stock RTD 'oh noes prophecy' nonsense. But fair's fair, the ice city looked neat.
Spoiler about the upcoming Christmas "Special", a IMDb casting rumour confirmed true: Spoiler
*DON'T LOOK IF YOU DON'T WANT TO* A James Bond Actor*DON'T LOOK IF YOU DON'T WANT TO*
Anyway I didn't mind this appetiser clip but it was too short and snappily paced to leave much of an impact.
'Alright guard, begin the unnecessarily slow moving dipping mechanism...' - Dr. Evil
'Secondly, I don't see why "income inequality" is a bad thing. Poverty is not an injustice. There is no such thing as causes for poverty, only causes for wealth. Poverty is not a wrong, but taking money from those who have it to equalize incomes is basically theft, which is wrong.' - Typical Randroid
'I think it's gone a little bit wrong.' - The Doctor