PhD Decisions went out the end of the first week of March, which seems rather late considering some people who met the Feb 15 deadline in 2010 heard back on March 3.
Needless to say, they're behind this year. Their website says decisions should come in 3-4 weeks and than those meeting the Feb 15 deadline should hear by the end of March. These clearly aren't the same thing, but they do appear one sentence after the next.
Since their Director of Admissions really was the whole department and they haven't filled the position, I would guess other people are trying to do their own jobs and get decision letters together. Also, their spring break was last week, so if there were decisions to still be made, I'd bet nothing got done last week. I did e-mail admissions about two weeks ago and Alain (he's the Associate Dean of Academic Administration and is the entire Fin Aid department) let me know that applications were still being reviewed, but he didn't give me a time line for when letters might go out.