This is what the email I got when I got waitlisted said
"In early May, applicants remaining on the wait list will be reviewed and the top 30 will be ranked and notified by email. If you would like to be removed from the wait list, so that another applicant may take advantage of the opportunity, please notify Enrollment Services."
I've been sending updates, letter of rec, and plan to send my letter of intent after I attend the Second Look event for accepted/waitlisted students. I think from last year's threads people found out in May what their rank on the waitlist was