One of the many reasons I love Doctor Who is how there's always a moment or two of "Wot?! Wot?!" that is sustained throughout the season. Like the drumming with the Master, and Bad Wolf, etc. Something important but confusing that runs along the backbone of the story arc that they remind you of every once in a while, just in case you've forgotten. I'm sure it sends the fans (i.e. me included) reeling mad trying to figure out wot Davies and now Moffat are up to. Wotever it is, I'm sure it's brilliant.