I had interviewed last year with Nova, so if it helps, I can tell you what they asked me:
-Explain your MCAT scores?
-How are you going to prepare for the rigorous demands of Medical school?
-Why do you want to become a DO?
and other general questions. SDN is very helpful regarding preparing for interviews; see "Nova interview" thread. Also, the internet has a wealth of info. regarding what questions will/can be asked on a medical school interview.
I just filled out and sent Nova's secondary recently, so I remember the questions. On Nova's secondary, the questions were:
-List your medically related activities; dates, level of responsibility etc
-List where you've been employed since in college; dates, level of responsibility, # of hrs/wk etc
-Have you applied to NSU-COM before? When?
-Have you committed a crime for which you were arrested? Explain.
and last but certainly not least:
-List your reasons for desiring to become an Osteopathic physician?
Hope this all helps. Good luck.