Some days ago I saw the Christmas-special cast photo: There was Bill and I was happy. Until the moment I remembered that this is still a Moffat-era episode. Remember that Christmas ep where Clara suddenly lived in a house and there was no explanation whatsoever? It's not just that - the Moff is generally bad at explaining stuff (Where the fuck were they when we were introduced to the War Doctor out how did they get out of there?!). So what if we don't get a proper Bill/Doctor reunion? What if Bill is just there as if she'd never left or thought the Doctor had died?