I called yesterday. At first the secretary put me on hold, intending to redirect me to someone handling waitlist inquiries. But then she came back on the line and said that she was "told to tell me" that there is movement, but it is very, very slow; and she didn't have the wherewithal to give any specifics.
Obviously, no school would be reckless enough to say "there is lots of movement, expect us to call you any day now." So these sort of standard, uncertain responses are to be expected. I'm still hopeful though, there is time left.