I know that for everyone riding the waitlist, the journey is probably just beginning. Obviously take all of this with a grain of salt because it only offers a limited perspective on where things stand, but here is some early information from LSN:
There are six people have declared that they will be attending.
There are probably over 100 people who have been accepted but haven't indicated their intentions. *I imagine that many put down deposits at WUSTL, but could be picked up off of waitlists elsewhere or take another offer somewhere else.
There are over 50 people who were accepted, but have withdrawn.
There are over 10 people who were waitlisted, but have since withdrawn.
It looks like WUSTL started going to the waitlist in late April last year, just before their May 1st refund deadline. If withdrawals continue throughout this month, then perhaps we could see some movement begin in the week or two leading up to May 1st.
Good luck to everyone on the waitlist...I'm right there with you.