Just be yourself!
I was so nervous for mine... turned out they were super laid back and really nice! They were cracking jokes and I was giving it right back to them after awhile!
They asked me certain questions as far as if I was good with power tools, how I feel about specific surgeons " yes they named names".. heh um.. I told them that teamwork is the utmost importance to me, and just because your floor is separated by "teams" you dont just not answer call lights because its not your team.. etc... I told them I like working in a smaller setting, and that the OR is always what I wanted to do!
All in all, just be yourself. They are not going to expect you to know a whole heck of a lot, thats what orientation is for! They are more interested in you as a person and how you will fit in with the crew, etc...
Good luck! Im sure you will do just fine!