I have heard the same from the same source who told me where the launch would be. The superchargers being there is apparently one of the reasons why the launch would take place there, with the the other reasons being 1) enough space for 1,000 attendees to the launch; and 2) enough space for people to do test drives after the launch.
I drove around the terminal during my lunch today. There is construction at the east end of the terminal, nothing like a supercharing station yet so can't confirm if it is the place or not. Another possible location is inside the carpark, which I didn't drive in.
I may go in again and take some pictures next week! keep you guys posted