I did my interview on Nov. 22nd and got my acceptance letter on Nov. 24th.
I'll tell you how mine went, but it may not be exactly the same for you.
It seems as though they have two groups of students who interview either in the morning or the afternoon. I went in the morning. Typically, they'll have two interviewers who will ask you questions about your interests/life/background, etc. and will probably ask you about an academic weakness if you have one. They may ask you things like an ethical question or, if you have a healthcare background, something about your field. I would bet that they're going to ask you "Why DO"? or "Why are you interested in this College"? From my experience, I believe that the interview is mostly personal designed to weed out the obvious freaks. I only had one interviewer because the other one was ill (I think they usually have one clinician and one basic science prof). I have a pretty high paying job so my guy asked me if I was going to be able to handle the sudden drop in income. He also asked me what I thought the difference was between an MD and a DO. He asked what I thought the term "primary care" meant. He picked at a couple of my grades and asked me what I felt my strengths and weaknesses were. It seems as though their questions are a mix of standard questions with others that are pertinent to your file.
Overall, I would say the best thing to focus on is to RELAX. It's mostly a social interview and they're supposed to rank you in one of four categories (do not recommend, recommend with reservations, recommend and highly recommend). They also take a lot of notes while they're talking with you. After the interview, your file and they're notes/recommendations go to the admissions committee who meet on Wednesdays. I think there's 13 or so people on the committee. They say that they review about 20 candidates per week of the group that interviewed the previous week. They sit around at a table and really dissect your file. They read your letters of rec out loud and then take a vote. All you need is a majority vote and you're in. They let you know your status within two weeks of your interview. If you accept, you're required to give them a $1000 deposit within one month of your interview date and another $1000 deposit sometime in the spring (both go to your 1st year's tuition). When I was there, they said that they've interviewed roughly 180 students and about 30-35 have put in their deposits. They interview about 500 people out of a couple thousand apps and they offer about 370 spots. I know that they also put people on a waiting list and about 66% of them eventually get offers. The waiting list people can, technically, get an offer all the way up through July.
Bottom line is that if your interview goes well and the interviewers seem to like you, you'll probably eventually get in. Don't sweat it.
If you want, you can e-mail me personally.