Tough to post this after such a rough day for some very, very qualified candidates - but:
Had my interview today. Pretty much exactly as expected from what everyone here has said. Interviewer was friendly, but the interview was still pretty intense. Felt a bit more like a job interview than some of my other interviews. Lasted a little over 40 minutes from start to finish. I felt well prepared, and I believe I gave my best answers to the questions asked. Out of my hands now. Columbia is definitely my #1, I just hope I articulated that clearly enough.
Best of luck to everyone.