Yea, there is no actual interview.
There really is nothing you need to prepare for, just bring any questions about the school if you have them. There will be a short writing session (can't prepare for that), a short intro to the school, financial aid, Q&A, tour, Mock PBL session (I think they take notes on how you perform, but theres no way to prepare for that either), then lunch.
thats it 🙂
They say if you have extra time (you should be done about 1ish), go tour LA but I would rather roam the school- go look at the dental frat houses or something 😉