All 4000 boards have not been populated yet. It actually becomes an issue with storage to have so many boards sitting built all at once. They have to be kept somewhere which tends to be awkward because boards must sit in ESD safe trays on grounded carts (remember that picture of the 80/105?). Issues with humidity control are important because parts are no longer sitting in sealed bags, although they are already soldered so it is more of a general storage thing. Craig meant that absolutely everything is ready to go, absolutely every part is sitting at the facility, things are being tested carefully and slowly still, the build process is understood...umm I don't know what else to add so I don't read the next 10 pages about how the sky is falling.
There is merit in being vague, but I'll take the chance anyway.