I am getting this too. I preordered with Amazon but the box hasnt arrived. If they are cutting preorders off like this something is wrong. Surely we should be given enough time for our boxes to arrived.
They wouldn't be cutting us off if we haven't input our retail keys in yet at this point. They've already stated they would give a grace period of "several days" so we can get things in order. More than likely they may have needed to take the server down and they just haven't put up the warnings yet or something. At least I hope that's the case.