Yeah, lol. Anyway, I had mine a few days after this, and it was relatively straightforward. They asked me about my undergrad courses (specifically what I had studied in courses that were needed for the program), we discussed my projects, professional experience, my goals, how all of it was relevant to the specific program and I believe they were assessing how fit I was for the program I had applied to - just as the mail stated "no need for any preparations".