first of all, congrats you guys! =)
i had my interview the first week of february of last year. there was only one other person interviewing with me. it was exactly as the letter says, interview, meeting with the head of the finaid department to discuss finaid, tuition, and things like that (great time to ask questions), a tour with a faculty member, and lunch with a student.
i had 4 interviewers, all faculty members, Dr. Johnson being one of them. They were all very nice and friendly, but don't be fooled, they ask pretty tough questions. know your current events, theyre very particular on that ive noticed. they also asked me what the last fun book i read was..so read something 😉. other than that, you'll shine if u just be urself =)
the finaid session, the tour, and the lunch are self-explanatory. ask questions, they like it, ppl like talking about their schools usually; and wear comfortable shoes.
good luck everyone!