For those interested in Purdue:
I emailed the administrative coordinator to ask if interview invites have already been sent out. She told me that all invites should by out by early next week, but if I do not receive an invitation to interview, in-person, this does not mean that I am not still under consideration for admission. She said: "Since we are limited as to the number of visitors that we can accommodate for a visit, many applicants are interviewed via Skype or telephone."
Good luck to everyone!