If it helps, I know someone that interviewed about two weeks before me (we both applied for the c/o 2015) and she heard back at least a month before I did. We were both accepted but decided to attend other schools. They just get backed up reviewing applications, so don't fret if you haven't heard back yet and you know others have. Don't quote me on this, but I think they also sent out acceptances to roughly 1.5-2 times as many students as they had spots for because they know that a lot of students choose to attend other schools, so if you got an interview in the first place you have a pretty good chance of getting accepted. I hope that settles some worries, and good luck to you all!