I can't remember which phone it was but it was the same situation at launch, no UK orders had shipped right up until the day before launch and they were all sat in a Cork warehouse and therefore next-day delivery is easy.
You may be thinking about the iPhone 4 or iPad launch. The iPhone 4 pre-order customers received an update the night before it was delivered. That'll be par with very late tonight/early tomorrow morning for the 4S.
Now who's for toast and coffee?