Spoilers for the new Series 6 trailer.
Ladies and gents, this may be a running contender for the 6A cliffie. Sure, we don't expect to actually see the cliffhanger on the trailer, but that's precisely why it might be there!
(Also, joke-that-may-not-be-a-joke-but-I'm-just-guessing-here that I'm too lazy to macro: Series 6 being split into two parts, which could be called 6A and 6B. The Second Doctor ALSO has a 6B... maybe.)
LJ appears to be fritzing on me, so for the moment I'll post, and add tags later.