The interview questions are generally the same ones you get from all of the programs. They may change the way they word things, but it's basically the same thing. They're focused primarily on 1) Why you chose to pursue this degree/career/specialty, 2) How you will handle the stress and toughness of the program, and 3) Your goals after graduating.
The interviewers will have read your personal and goal statements, so you can refer to them but give more details. They will not have seen any other part of your application though (e.g. resume), and therefore won't know about your work, volunteer, or other experiences, so it would be good to discuss those. I'm not sure if things have changed this year (the snail mail notices really threw me for a loop), but if not, those are the themes from the previous years.