I am still waiting as well, and I know a good amount of people who also haven't heard yet. I called on 3/26 and the woman said that I should hear in two to two and a half weeks. I also visited recently and I think the same woman told me that I would definitely hear by the end of the month. I was talking to someone who is there now and said that she got her waitlist decision at the end of April/beginning of May. So I am expecting something around the beginning of May.
Anyway, I think there are a couple reasons why they are pretty late this year. First of all, they are snobs, so they are going to take their sweet-ass time no matter what
Second of all, I think they are having some major staffing issues in their admissions office. I know that one of their main admissions counselors left in January, which is obviously really bad timing. I also know that their dean of admissions who was there last year did not return this year, and their current assistant dean of admissions is pretty new (came in January). And when I visited recently I only saw 3 people in their admissions office, 1 of whom I think was a secretary (don't know how big admissions offices usually are, but that seems small to me).