First of all: Veliside, grats on your acceptance.
I actually can shed some light on this. I'm waiting on word from UCLA as well, so I called the Classics department, and I was transferred to someone who told me that the person in charge of admissions notifications (or something like that - maybe an administrator? at least, the person responsible) has been out sick for the last *four* weeks. So, yeah, that could explain why pretty much no one has heard anything...
And before you start asking for your fees back, I was told by an adcom at an university where I have been accepted that this season seems to be very "late," i.e. a lot of decisions may be coming in right before April 15th. Pretty crazy. More competition, less funding, etc.