As I indicated in my previous post on Wharton interviews, they have totally changed. Reported interviews now consist of 100% behavioral questions. See reports at http://gmatclub.com/forum/calling-all-wharton-2011-applicants-95623-900.html.
Clear Admit now has a a full report up. See http://www.clearadmit.com/wiki/index.php?title=WhartonInterview.
-Adam
Read the full article: Update on Wharton Interviews: 100% Behavioral