I guess i am not sure what you are looking for here. Do you want questions that your panel can answer? Or, are you looking for a list of good questions that should be asked because the answers will offer good info to incoming students? I think there is a lot of info that would help new students with choosing majors and basically gaining insight from former students.
I think that new students would want to know:
-What college degree's most directly end up in jobs?
-How much of a degree do i need to get a good job(ex-masters for teaching)?
-Is the student loan debt you incurred worth the degree you ended up with?
-Did the skills you learned to get through school help you with future jobs?
-Do you wish that you studied something else?
-Was getting a masters degree worth the effort and cost?
-What was the best decision/choice that you made in college?
-and the worst?
I hope this helps and is close to what you are looking for. I wonder all of these things and i would imagine that a bunch of other people do too. I know so many people whose education has nothing to do with their career, and i wonder if studying something different for some people is the answer.