Rather confused, possibly in an attempt to avoid spoilers. I don't think there are any, but it is not easy to tell.

I am happy to hear there is a big plot twist. I hope they are not just talking about a big plot event and calling it a twist. But knowing Moffat it will probably be a twist.

I wonder whether the Silents (Silence? nobody seems quite sure how to spell it) take on the appearance of others.