They'll be pretty similar to the questions you'd get for any position (they ask for a time when you were in a situation and how you handled it, if it was successful, and what you learned from it). I think my interview for Ops training was a lot easier than the ones I had for SRO, although the company I'm at was (and still is) pretty pressed for instructors. Just as a heads up, you will be expected to give classroom and simulator training.
I've heard that some companies will have you do a short classroom session to see how you do (I didn't have to).