I posted the Columbia acceptance! (I feel a little shy about these boards, but I'm definitely a lurker.)
It was a pretty generic email from Alan Stewart, the DGS, but he CCed the professor I am most interested in working with, who then emailed me a few minutes later with a much more personalized email. So... somewhere in between the two? I'm sorry, I honestly don't know if they're finished notifying or not. If I had to guess, I would say no, since there aren't a lot of posts up yet, and I know they're a pretty big program.
Best of luck, everyone!! (I applied to Cornell, Berkeley, Chicago, and Virginia too, and watched all of those acceptances go up without hearing a peep... I was pretty convinced I was out of the running until today!)