Congrats on your interview!
At the beginning of the day, you'll get little cards with bios about your faculty interviewers. I had mentioned fishing in my personal statement, and I noticed that both of my interviewers had that listed as a hobby. One of them mentioned fishing to me during my interview- asking where I liked to fish, etc.
I think KCOM's interviewers seem to be varied in their styles. Some are more "traditional" and you can tell they've REALLY read your file. I had one like this and he proceeded to go through a mental list of questions, it seemed. What was your favorite class, what was your least favorite class, etc. This guy also said that his job was to be my advocate and to present me to the adcom in the best light he could.
My other interviewer basically proceeded to try to talk me out of being a dr. I think it was his way of being honest with me. He did tell me upfront that he would recommend me, though. And he was very open about answering my questions as to what he felt the future held for family practice. He was also full of advice for rotations/residencies and told me that his door was open if I ever wanted to talk.
You are allotted an hour for interviews and both of mine lasted that long. However, I know that some people have had shorter sessions.
The admissions staff did a short interview as well, double checking my file for accuracy (addresses, etc) and asking a few "get-to-know-you" type questions like "What are your hobbies" and why.
You should check interview feedback here- there are something like 42 interviews posted. I found it to be helpful in preparation.
Finally, good luck to you!