I'll write this now while it's still fresh in my mind and for everyone else who is still wondering about the interview process (I was in the same position up until today).
I arrived today at 830am on the second floor (they call it the 1st floor) of the SEC building. We immediately got our pictures taken for their future reference and offered us breakfast bars and water/soda. We were then taken into a small conference room (about 15 people were in my interview group) where we got to meet the associate dean for admissions (Tom Mueller). We did three things here: first, we went around the room and had to do a short introduction (name, major, interests) and then say one interesting/weird thing about ourselves (mine was that I did a 100 mile bike ride last year). A quick note that Tom Mueller is a really funny, light hearted guy and makes funny comments about a lot of things to lighten the mood/calm nerves. After this, he goes over DMU student pass rates and a financial aid lady gives a generic talk with a hand out.
After, we are taken on a preliminary tour to see the simulation rooms, mock-surgery rooms, and other class rooms. At each point, a professor of the school will tell you about each area and answer questions. The last activity before lunch was to talk with two OMM fellows who show the OMM technique and they answer some questions you probably wouldn't want to ask deans and/or professors.
We then had lunch with 4 current students who answered more questions before the interview and would tell you about loans, what your interviewers are like, things to do in the area, classes, etc.
After lunch, there were 2 interview groups (1 early and one later). While one group was interviewing, the other group went on a tour of other buildings, the gym, library, school store, and more classrooms.
Personally, I thought the school was very impressive. At the end of the day, every single question you could think of was answered (you have many opportunities to ask professors, deans, and students questions). The technology and facilities appear brand new and up to date/state of the art. The student body seems very close-knit and the local area is calm/serene (but I'm told the night-life is pretty good too). My interview was very relaxed with 2 professors and 1 student. It was more a conversation (one initial question, then more based off of your response). Mine took 30 min, but a few went to about 40-45 min. No ethics questions, mostly about activities I've done or my personal philosophy on certain topics (what qualities should a doctor have, etc.). My hardest question was "if you could write a book, what would you write about and why?"
Overall, great school and I'm glad I had my first interview here. Hope this helps.