I interviewed in late November, and the admissions representative told our group that the school makes offers once a month, every month, and that they run a month behind in selections (so the earliest November interviewees would hear anything at all is January). She also said that very few interviewees (usually less than 20 a month) get an offer right off the bat - most get hold emails at first. So don't get discouraged if you get a hold - you could very well get an offer later. It conflicts with what others have posted that they heard, but that's what I was told.