10dulkar!
Well i recently completed my interview round and it was conducted by alison merzel the admissions director.
I would place the interview duration between 30-45 minutes.
It was pretty conversational with the usual MBA interview questions and there was no case question asked.
I had to log in to a link that they provided me with for the video interview and my interview was recorded for their use.
There was no stress during the process and i came out feeling better about the program.
Some pointers though,
It usually helps if you have a clarity of what you want from the program and how you feel you can contribute.
Use a lot of incidents to put your point across that helps them understand why we did what we did at that point in time..
All the best!