My interview this morning was short but thorough (lasted 25 minutes) and the questions about my case study was like 10-15% only. Mostly about your CV, what I'm currently doing for work, what I plan to do when I go back so on the essays also.
I feel also that the interview was less about my answers but more my demeanor, or I could also be overthinking it. But general questions like, why LKY, why MPA, what the program will do for you, etc.
Anyway, the wait is on. Good luck to all of us!