I think the MMI's are like different "stations" where they give you an "ethical delimma" and you just talk for a couple minutes about what you would do. This is in addition to the regular "get to know you" interview and from what I heard they are also still doing the essay. Good luck at the interview and when you do your tour of the preclinic feel totally free to ask any of the students in there questions about anything (it will be myself and my class in there at the time, we and the instructors are all pretty cool and wouldn't mind at all if you walk around asking questions and looking at stuff).