I also got Wharton interview invitation this morning. The letter says " Please log into your Wahrton account and select "Search" in the Events box to the right on the main page. Next select an interview type (On-Campus or Alumni) and proceed to schedule your interview. Please read the instructions given for each type of interview very carefully. "
But on the web page, I found there are three options
On Campus Interviews Off Campus (HUB) Interviews with a Wharton representative Alumni InterviewsI found
According to the letter, I only have the options of 1 and 3 (On-Campus or Alumni). I don't know whether I can choose option 2.