Yeah, I've heard the same thing. I'll be picking up at Villa Park, and they are going to be trying to get the car on a truck right away. They are trying to arrange a special pickup for us because of our situation (I have cancer, and my 1.5 year old just had a liver transplant and still needs a kidney transplant). Apparently they said that the service center is closed on Saturday, but they are making arrangements for everyone to come in for our pickup. They said it is possible it won't be ready until Tuesday, but they think they should be able to get everything done for Saturday.
My DS has been pretty awesome though. He emails me status updates almost every day, and calls periodically to make sure we're still good for a Saturday pickup since they need to make sure people are willing to come in on a holiday weekend for this. They are making a really big deal about us getting the car, and said that they have something really special planned for my son. I'm not sure if it will be one of those Radio Flyer cars or what, but they've already given him a bunch of clothes and stuff.