I've just watched it and i've now got a "time head"
River song is his wife i believe (or future wife) that was eluded to in the last series the one with the angels .But for some reason i can't get "the doctors daughter " out of my head ,i am starting to think that there is a link there somewhere and the writers are going to use this series to develop that character either for a spin off or addition to Dr Who or Torchwood