To those who don't understand why 3 days late = 4-5 weeks delay or even longer, please read on.
Firstly, you need to remember that production facilities aren't only producing GT5 copies and are probably busy 24/7 making Blu-rays. Everything goes by a schedule and there's little time for buffer. The production facilities are probably churning out big titles like Call of Duty, Need For Speed, Assassin's Creed which are all November releases right now and are at full capacity.
If GT5 was 3 days late and it only had 5 days slotted in the production facilities, Sony can't just tell the production facilities to finish GT5 and delay all the other games. That would be chaos. Imagine COD, NFS, AC: Brotherhood all getting delayed, people are going to be mad pissed.
So, GT5 has to wait until there's a free slot to copy the games. That can take up to a week, 2 weeks, however long it takes. Hopefully this can be resolved in a couple of days. That's point one.
Secondly, global distribution can take up to weeks to get around. The most cost effective method to get 5 million discs around the world is by sea. However,those cargo ships don't just ship GT5s out. There's all sorts of stuff from all kinds of companies that needs to be shipped out to a certain location. Taking that in mind, cargo ships can't idle in the port, because they can't afford to be sued by companies for being late and screwing up their business. So they don't care if the GT5 shipment isn't there, they just sail off without it.
So now GT5 misses the original shipment date and needs to wait for the next ship to come. Funny thing is, these cargo ships aren't like planes and aren't as frequent and can be days to weeks until the next ship arrives. Also need to take in mind that ships are slow and can take weeks to get to destination depending on how far it is.
If you add all these things up, it's reasonable to see why Sony can't give us a date before the end of October. They are probably scrambling to see if there's any open production slots in any facilities and checking with shipping companies to see the next available ship that isn't full. Taking in the holiday seasons where everyone shipping stuff, it's going to cost extra for such last minute shipments. If you account for all the locations GT5 is shipping to and how it's aiming at a worldwide release, then it can be quite a long delay. Hopefully GT5 gets out as soon as possible even if Sony has to pay a hefty penalty for it.