Ahaha I wish I had kept up to date on this thread. I've been getting spam phonecalls on my cell for the better part of a year now and generally don't answer anything from numbers I don't recognize. I received such a call earlier this afternoon and wasn't going to pick up until I realized at the last second it was from a Columbus, OH area code--naturally, it was a POI at OSU.
I can confirm that the interview [which the POI assured me "was not an interview"] was pretty broad in scope: I think "what do you want to study?", "why [my alma mater]?", and "why OSU/Columbus?" were the only questions I was asked in any sort of formal/scripted sense. The rest was more or less just a conversation [which seemed overwhelmingly positive].
Echoing PA, good luck to everyone.