Hey cabound,
Touro is my first choice school as well and luckily I recieved my acceptance last week, so i'm excited!
One thing that helped me was knowing the format of the interview beforehand: most likely 3 people will interview you (DO & basic science faculty, and a med student), along with 4-5 candidates in the same room - very unique and unheard of interview style, and because it is open file they can pretty much ask you anything from your application. This may sound intimidating at first since others can hear about stuff from your application, and because this is in a group setting rather than one-on-one, I found it enjoyable however as I got to learn about some of the wonderful things my fellow interviewees have done, and in many ways having a group like this was like a support group. Having said that, I think it is advantageous to get to know your fellow interviewees before the interview so as to not feel nervous in front of them (b/c i'm from San Jose, instead of driving directly to the campus I decided to drive to the Marriott and take the shuttle with the group to get to know them). Overall, I think mentally preparing yourself to expect this type of interview format makes it less stressful, rather than learning about it just before going into the interview room.
Also, make sure you're attentive to what others are saying as well during the interview, as I've heard that they could possibly ask you questions about what the other person just said (luckily this didn't happen to me, but being nervous can make you zone out). And definitely pack a snack since they feed you after the interview...my stomach could be heard across the room!
Overall, it seems they are looking at how you conduct yourself during the interview, and if you can maintain poise while developing and delivering your response since you are in a group setting. I'd recommend preparing yourself for questions regarding your reasons for medicine and DO, go over your application, and definitely check out the interview questions & feedback on SDN. Those that interviewed me were very nice, and as you mentioned, it felt like they just wanted to know more about me (my hobbies, clinical experiences, how do you learn best, what being a team member meant to me, etc.), and explain things on my application that may be questionable, so you should be prepared to answer any questions marks on your app, like poor grades or reasons for switching majors. But overall it was an enjoyable experience...I was a bit nervous at first but got more comfortable as the interview progressed. I'm sure you'll do fine...good luck and try to enjoy your interview day!