Just interviewed today on-campus with an adcom member. I think it went very well. Wouldn't call it a casual conversation exactly but it was somewhat laid back. Pretty standard tone for an interview in my experience. I feel really good about it all in all.
Questions were as follows:
1. Best experience in undergrad
2. Talked about my first job out of school.
3. Talked about my tranisiton to my next job.
4. Talk about working in a team that you did not lead.
5. Talk about a challenge you had in a team you lead.
6. What would the people you lead in that experience praise you for.
7. What do you wish you did better in that situation
8. I started my own business recently, so she asked why now. And why get an MBA so soon after starting a business.
9. Questions for her. She gave me some great info about the mindset at Kellogg and what she observes.
I didn't get the Why Kellogg question exactly, but I tried to tie each of my answers back into "why Kellogg," so it really wasn't necessary.
There were a couple things I didn't get to mention that I wish I had, but I feel great about it, honestly. Hope this info is helpful to you all!