I work on a surgical unit but we are also the designated trauma floor at a level I hospital. I don't really have any advice on the interview (we didn't get trauma pts when I interviewed) but I wanted to say good luck!
I would think you would get traditional questions though, it's still in the end a med-surg floor.
We usually get falls, MVAs, motorcycle accidents, and shootings/stabbings. They are an interesting group. Most of our traumas (except for the falls, they're usually elderly) are young without any PMH so them being in the hospital is a huge deal. They can go either way on being grateful/whiny. It's a fun population though and I actually love working on the floor I do because of them.