Don't know if this helps, but I hadn't heard anything from a particular university and I called them to 'inquire about the status of my application'. I was then told that they would not be offering me an interview. This is a program that was higher on my list - I told them that and offered to email the director/chair/anyone else to further express my interest, and was told, quite flatly, that this was a final decision and they would under no circumstance be offereding me an interview. Not that they were ever going to clue me in unless I called, I suppose! But I do appreciate their honesty.
So I guess some don't even bother to tell you. 🙁