Not sure EXACTLY how the interview selection process goes, but I do know that other schools will use a "point system" to determine who to interview (i.e. PCAT comp score + GPA*25 = Up to 200). What I've seen from other schools is anything >150 will get you an interview, and it's up to you from there. My interview was on 11/1 - very cool setting in the middle of a medical campus. Got a really good vibe from all the students there and the Asst. Dean was really cool too. I was interviewed by 2 faculty members in their respective offices, and it's more or less just a conversation. You might get grilled with a few "Why pharmacy? Why MUSC?" style questions, but otherwise, they just want to get to know you (is the impression that I got).
Good luck! Hope there's something helpful in there for ya!