This is a dissection of the link
that aired at the end of the 2010 christmas special. There are some spoilers but none that will in any way affect your enjoyment of the show.
Musketeers... or at least 18th century French people
Judging by the decor, outfits, and firearms, looks like the 1960's. Also, Jammie Dodgers and the fez gets a mention!
Stetsons are the new thing now
Look who's back...
Who is this man? I'm going to take a guess and say he's ether crazy, dangerous, or both. Wait... Doctor?
This isn't our TARDIS! Sort of looks like the Lodger TARDIS.
She looks a little out of place
We're doing the creepy astronaut again. Moffat, did you have no childhood?
The Doctor has a box!
River! Moving a bit fast, aren't we?
Here are some familiar tentacles
Tell me I'm not the only one who thinks these look freaky scary
Amy's not really looking herself
"See these eyes? They're all lies. The one thing I can tell you... the monsters are real."
What could it be? I'm thinking Roswell. What about you?