Also wondering this - did not receive an email. I feel like it probably means we did not get in, but they were one of the schools where the graduate school and the MFA program seem to do things differently. So maybe it's for a certain kind of TAship or something. And I doubt anyone who will get waitlisted would have been asked to interview yet.
So, it's not a good sign that we didn't get an interview request, but I don't think it's definitive. Just my two cents.