ICO would not be continuing to interview students if their class was already full. For reference on the timeline, I interviewed at ICO in mid-March two years ago with two other applicants and all three of us were accepted. The insider information is that ICO over accepted last year, and we had a larger entering class than we anticipated, so they are more than likely being conservative with acceptances compared to previous years. That said, it is a wait list so I don't think anyone could guarantee you a spot, and calling the admissions office would be the best way to know your status over time.