I thought it might be fun to brainstorm on how they will explain the similarities between Oswin and Clara when she comes back later this season. My guess is that Oswin will be Clara's daughter. Oswin was making a voice recording and souffle for her mother. I would like to think that nothing that's been put in the show was a throw away, that it all means something. This would also provide drama later on when The Doctor has to decide if he will tell Clara about the fate of her daughter or let events stand. There could also be anticipation for the audience if he doesn't recognize her right away, she as after all in Dalek armor
P.S. could someone clarify something for me? When I first heard that she was coming on the show I had heard that she had been on the show as Clara before. I can't remember a guest character by that name and I've scoured the internet looking for it. Then I read her first appearance was tonight. Was the source I originally heard it from wrong (I can't remember where I first heard it but it was defn online)?