I had an interview and everyone was lovely (especially the chief anatomy professor and current student who were on my panel!) The students were around to put you at ease beforehand and the whole day was nowhere near as daunting as you would expect.
I was asked a lot about ethical issues and everything I'd mentioned in my personal statement (it seemed to form the framework for my interview) plus I got asked about some science-based questions leading on from my work experience and extracurricular reading I'd done.
Most importantly, don't panic! That is easier said in hindsight but my panicking really wasn't worth it...and yes, I did get an offer :-)