Yes AP191, got invited this Monday and going on November 6th!
I actually talked to one of the admissions directors today at a grad school fair at my university and he gave me specifics about the interview because I didn't really know what to expect.
I guess the interview part isn't group-style but one-on-one or one-on-two: just one applicant talking to one or two faculty members for about half an hour or so. They ask typical interview questions and throw some typical critical thinking scenarios at you. Then you get a tour, meet with some other people, have lunch with students at their cafeteria, etc.