Congrats on II! I interviewed 10/14. It was very conversational, with pretty standard questions throughout. I had two interviewers (one MS and one member of the admissions committee). I would know your application well. They want to get to know you as a person, so just be yourself, take a deep breath, and relax. My interview lasted a bit longer than 30 minutes because I was asked a lot of follow-up questions based on my responses/app. I thought the entire day was a great experience overall. It started off with breakfast with a current student, then a tour with a group of students, an introductory OMM video, and ended with the interview. By the time you get to that point, you'll be so pumped to go there that you'll be excited to show your strengths as a candidate. Be confident, you got this!