I just got off the phone with my colleagues in admission (remember, I'm in another office right now). Most of the waitlist will hear one way or the other early next week. We usually hold onto a few applicants in case of more "melt" (the admission "industry" term for when deposited students drop out of the class, usually because they've gotten off a waitlist elsewhere), but that will be a very, very mall number of cases.
We'll also be taking down the online application system shortly so that we can clear the way for the new students information system, our online reading system, and the Common App. The site's been buggy at times, but if you have trouble connecting to it in the next few weeks, it might be because the system is completely going away.