No, it's not millions, but every time something big gets released like an OS revision, it gets hit hard and it's obvious that it's just the amount of people hitting it. What other reason would it be when everything works just fine any other day?
Sorry for the download speed problems and thank you to those offering alternative solutions. We are paying some money for good bandwidth and global caching. We will look today to the download statistics and talk to the service providers to see what was/is going on.