I interviewed there last weekend. They start with a welcome talk and then break you into two groups. One group interviews and the other group takes a tour with current students. Then you switch. The students are really nice and willing to answer all of your questions.
The interview is an individual interview with one faculty member and one current student. The student just observes, though. The questions are straightforward. Why GSU? Why PT? Why should we pick you over someone else? Know your strengths and weaknesses and know APTA Vision 2020 concepts. The interview lasts about 20 minutes.
I received an acceptance email within a week. It looks like a strong program and everyone was very friendly. Good luck!