Thanks! Congrats to you as well! Looking back at the e-mail, the word "interview" was not specifically mentioned. He did mention that he wanted to talk with me to discuss my application in more detail via phone or Skype. I guess I shouldn't fully assume that it is an interview, but at the very least it is correspondence. More than I've received from other schools so far, haha. Definitely sounds like they want to get to know us better! Either way, I would say we should probably prepare for an interview-like conversation, just to be safe. What discipline are you applying to?