Hi everybody,
my interview went well (I had it in Reims on January 19th), the panel let me speak for my 10 minutes as I was analyzing the article they gave me without interrupting (they were just taking notes). After that, they started asking questions based on the considerations I had made during the analysis, so I suggest mentioning only stuff you're really confident in during your presentation in order to shift the conversation over to that area. They posed 3 or 4 question each, my panel was composed of the admission director, a political philosophy professor and an economics professor; they really want to push you to your limit and see how far you'll go (e.g. during my presentation I commented saying that the author's opinion reflected Plato's view expressed in the 6th book of his "Republic" and they asked questions about it unitl I just didn't know the answer). They make very specific questions and they want concise answers of a minute at the most, but I would say is, even if you don't know the answer, try to argument your thoughts on the general topic of the question, they might lead you to the answer.
Stay updated with the news and most importantly, read the New York Times and the Economist of the days right before your interview; that's where they get the articles from.
I had applied for Reims campus for the Euro American program and I was admitted just a week ago. Hope your interviews go super well! :-)