Here's something I sent to someone via PM about the interviews.
"I would say know the curriculum well. It's a new curriculum that they're very proud of. Things like the CAP, scholarly concentrations, and the focus on active learning is important.
You'll interview with a faculty member and a student. Both interviews are very laid back. You will be asked a variety of things, but the biggest focus was for me, who I was, how I got where I was, and why I want to go to gw.
One final note is to be confident and believe you deserve this. They give out a lot of interviews sure, but they're really careful to only interview people they think would fit into GW. Your grades and Mcat don't matter as much as your fit. A lot of my classmates weren't top students (and a lot were too), but all of my class loves GW and the city. It's clear admissions knows that they're doing. "