I had my interview end of last week and attended an information session beforehand. The Director of Admissions said definitely not to panic -- more interview invites were coming soon. Only one other person was scheduled to interview the day I interviewed, so I imagine more invites will be coming this week?
As for the interview itself, it was the most enjoyable and fun of all my interviews so far! Very relaxed, questions about some of the more interesting projects I worked on as well as about 5 behavioral questions (nothing scary) + follow-up questions. I also highly recommend the lunch with current students -- very relaxed and got all of my questions answered (plus amazing food!). Overall, had an absolutely wonderful visit. Love this school