did you get an interview for a particular school? Go to that school's website. But just to give you a general idea for those of you preparing for next year...
Why medicine?
When did you decide to be a doctor?
Tell me about yourself? (this one was almost always the conversation starter)
Why are you interested in this school?
Tell me about your clinical experiences? which one was most important to you?
Did you do any research? tell me about it?
What are you looking for in a school?
those are pretty standard questions, then the rest are school specific.