I'm on hold at 2 of my "safeties"... if there is such a thing in med school admissions... and have gotten interviews at 3 reaches already. It's common practice...don't waste time interviewing well above applicants (who probably won't come to your school anyway). By putting you on hold, it's give you time to be accepted at other schools (that may be more desirable to you) and gives you a chance to withdraw. Which, I think in this process, is a very courteous thing to do for the sake of other candidates (I plan on doing it once I get an acceptance). If by December you still haven't withdrawn and/or you decide to write a letter of interest, they'll know you're more serious about enrolling and then may offer you an interview for later in the season.
To be honest, it's a pretty fair practice that in the end probably benefits the med school from wasting time on applicants who aren't serious about coming to their school, and alternatively, from applicants wasting time and money interviewing at places they don't want to end up at.