I'm typing up my review for "Nightmare In Silver" now, but this clip was released today by the BBC from tomorrow's episode.
Also, Jenna-Louise did an interview with What's on TV. The answer to this question was most interesting to me.
When asked how she and Alex Kingston got along, Jenna had this to say, "I never want to give too much away, because if you know how they get along it gives you an inkling of where the story is going to go, but it's an interesting relationship. Clara is fascinated by and very curious about this woman who was married to The Doctor and who she knew nothing about at all. There's also a mutual respect, they're both women of The Doctor, in a way!"