As far as I recall-- people were just barely getting admitted in march-- and I know people who were let in, literally days before orientation (You can PM Manofaction-- who amazingly moved down here from Canada literally on a moments notice)
As far as interviews go, They don't interview everyone-- which is good and bad. If they're certain about you by your application alone you tend to hear right away (I was admitted really early last year without an interview) But for production specifically directing, they tend to wait a little longer and interview a bit later. The unfortunate side of this, is you'll never know what to think of your application or chances until you get admitted or rejected. Try hard not to stress-- I know, easy for me to say, but remember all of us from last year survived the wait.
Not everyone let in to Chapman has film experience, although I would say that more than half of those admitted to Chapman do-- in fact many have worked professionally in other countries or have won awards at various festivals or have studied personally under respected filmmakers. But I also know people who had never picked up a camera before our first assignment.-- Yes, you get your first assignment almost as soon as you get admitted, but don't sweat it.
I'll let you know, I never contacted chapman until after I was admitted. However, if you haven't heard yea or nay by may, I would email the chair or whoever you interviewed with and let them know you're still alive and (Especially) if you have any additional materials you can send-- I think that's the key. Or you can wait-- which won't exactly hurt your chances. Like I said tonight I'm on set (At Chapman-- you have opportunities to constantly be on set regardless of your discipline) and I will ask the Grad assistant if he knows anything about where they are in admissions this year.
But also, bear in mind that since Chapman is new, the expectations for admissions are changing. There are twice the number of people in the year before me-- most of them a lot younger and less experienced than the students that came in with me (I think around 70 of us total).