Haven't heard anything. Hopefully some movement in the next two weeks, but last year calls didn't start coming until mid-June, according to the old thread.
Quoting the email from admission (my emphasis):
"At the
end of May, you will be assigned to an admissions counselor who will help you navigate the admissions process during the summer months when our review of waitlisted applicants is less predictable."
Fairly ambiguous, but I'm guessing by June 1 they won't mind if we all start calling