I am not quite sure where the next series will go. I get the feeling from the end of the current one that this is halfway through a two season/series story arc. There were questions left unanswered at the end of the last series.

The who is River Song saga will have been spread over three series by the end of the current one, and it has been built up so much it really needs a big payoff - a what the f*$£ moment - to make it seem worthwhile.

Anyway, roll on Christmas.