I just called. All I was told by Dr. O'Connell is that they started yesterday afternoon. He says, "it takes a while to send all those emails out. We are currently working on it."
That means that only two PIs are available at that time; and you shouldn't be worried.
I applied here for a PREP program; and the interview process was kind of hectic. I selected 8 PIs, and only interviewed with two during that interview cycle. I suspect a lot of professors are either busy or not available during that week.