I was in the same boat as you about a month ago so I will chime in.
Before I interviewed I heard from EVERYBODY that the interview itself was very laid back and relaxed. Well, it was exactly that. You will be at the head of a long table and will be interviewed by two professors and someone from the admissions staff. They didn't ask me any pressing questions at all, they just asked me things from my primary application so make sure you know it well! Couple things they will ask you for sure:
- Why WVSOM?
- Can you handle living in a rural area? Do you plan to practice in a rural area?
- Why DO?
I can tell you for sure they will ask you these questions. Otherwise, the interview was very relaxed, we talked about triathlons for a portion of the time so no need to worry!