If true, I wonder how they'll double the space. Whether they'll just add more floors or expand horizontally. From the picture, they look like they have plenty of room to expand horizontally. And I'm sure it'll be very hard to add more floors with causing an interruption of service.
From the way I read it, it's not a matter of doubling the facility, but doubling the capacity. Apple would be very foolish to locate all it's cloud-based eggs in one data center.