When I interviewed last cycle, I googled every prompt I could find and wrote them on notecards. Practice reading them for two minutes and talking about them. When you get to UA, you'll get a name tag that also has the order of the stations you're supposed to go to on it. There's no confusion, fortunately. The interviews are held in a set of mock exam rooms, so they're close together. The interviewers have your picture and name, but nothing else. They can ask questions- and they do when you stop talking. Each room has the station number, the prompt, and name of the interviewer on it. The stations that didn't have names on them were the acting stations. Tara joked that that was our hint for the day. You essentially have one minute to switch stations, two to read the prompt, and eight to discuss with the interviewer. A 30 second warning will sound, and none of the interviewers minded if you finished your thought before leaving. Overall, I enjoyed it. While one half of the interview group is interviewing, the other is in a series of talks about student life, financial aid, and curriculum. The two groups then eat lunch separately and switch. I had my interview in the afternoon, and I preferred that. I do recommend drinking something with caffeine at lunch to help keep you perky and cheery! At the end, there is a closing presentation with what to expect in the remainder of the process and an optional tour led by a med student. It took no more than a half hour, so I would definitely plan to be out before four. Good luck!
(if something has changed since my interview, please point it out)