10 - 12 other pre dents will be with you during the day
You will get a tour, lunch, and a financial aid workshop
My interview was 20 minutes and with 3 people: a psychologist, a pedodontist, and a admissions officer.
Just check out the interview feedback on sdn, as that's what I did to prepare. It was nothing out of the ordinary, all standard questions.
You won't get a decision right away, but they said that they are now in their second round of interviewing (Dec 1st to the end of Jan). They said that second round notifications will go out the first week(ish) of february.
good luck!