my TUCOM MI interview was awesome. my interviewers were some of the nicest people Ive encountered during this process. Just relax and dont sweat it at all. But if you want some tips then of course you should be prepared to answer stuff like:
why DO/osteopathic medicine
things related to your resume
things from your secondary
my time was shared between 3 interviewees with 3 interviewers so it goes by really fast. you dont get much time to say too much, a good thing and a bad thing i guess. it was one research and one clinical faculty and one 3rd year student.
again they were really nice. I kinda got grilled but only because they wanted to test my research background given i had so much of it...it was nice regardless. i was accepted 1-2 weeks later.
Good Luck!