thanks all. I've been checking obsessively of course, but really didn't expect to hear this early. Now I know I'll have to wait ages for anything else.
Here's one for the "do you think this means anything?" list:
one of the schools to which I applied has started sending me invitations to department talks, events, etc. Now, they could send these to everyone who applies, but in my fantasies I've been already added to some admitted student's mailing list and they just haven't notified me yet