I don't know about this but asking someone for what is on the written essay or interview questions doesn't seem right. Here is why:
First: most of the essays are about ethics. Although it helps to know what the topic is but it doesn't help that much. These questions are really easy to answer even for an ESL like me. There are a lot of essay questions that school can ask you. Knowing these topics will only make you more depressed which doesn't help you in the long run.
Second: Some schools are very sensitive about this information and ask the interviewees not to tell... Why would someone risk their acceptance for you?
Third: whoever has an interview at Buffalo this cycle is not going to tell you anyway cause you might take their spot if they help you. Again, why would they help you? This is the reality, sorry.