Same here. I got an interview invite from them end-Aug about 2 wks after my DAT scores got sent out. One of the first few schools I heard from, actually.
You might want to give them a call. My interview invite never arrived in the mail. If I hadn't called because I got some strange letter saying that I had to send in my application fee (already sent!) and if I hadn't called them to clarify this, I would have never known that they were mailing me out an invite at all!