Here is a very interesting blog written by a Tepper student from Taiwan. I think the author is a very interesting and warm-hearted girl. So you may ask her for some detailed information about Tepper. Hope it would help you prepare the interview.
Congrats, I am also applying to Tepper for the March deadline. I think the interview is very much like a job interview. Know what you wrote on your application well and be able to give specific examples. If you've been invited for an interview, you have a really good chance of being admitted.