Hi Kaitlyn,
I applied for production design, and my interview was on Tuesday. Joe Garrity and Ernie Marjoram interviewed me - their bios are on the AFI website, Joe is (I believe) the head of the department, graduated from AFI and worked extensively in the industry. Ernie is an architect and artist with a wealth of concept, design and technical representation/communication expertise. Both of them seemed to be really nice guys and incredibly easy to talk with.
The interview was really casual and quite enjoyable. They showed a 10 minute overview of the program on DVD, we talked about the program in detail (cycle productions, boot camp, thesis films), about narrative in general, why AFI in specific, travel, architecture, technology and design, etc. It really was as free-form as any conversation you might have with your design peers or architecture professors.
My advice would be not to sweat it, just be yourself and enjoy the conversation. If your website is any indication, you don't have anything to worry about!