Good Luck!
I had my interview scheduled in NYC in February, but due to the snow I had to have it via the phone. That said, I am not sure how similar my phone interview will be to your actual interview. BUT my phone interview was pretty relaxed. All of the questions were pretty straight forward, however they did ask me one tricky one: "What qualities make a good doctor?" then I answered, and they asked me which of my listed qualities (i.e. compassion, intelligence, honesty) I was most lacking. So I would watch out for that one.
Honestly though, I feel like I asked them more questions than they asked me - which was a little weird, but I am a very inquisitive person. I was accepted in March so apparently it went well!
Best Wishes!