Wait, so you think it is more likely that Apple knew about this for a month and blew it off? Even when they knew it would be publicly revealed at the conference? Still they did nothing though. It wasn't until it was picked up by the tech media that someone realized that this would be a problem and it became a priority. Then they developed, tested, and deployed a patch in 24hrs after the exploit was revealed publicly.
Are you crazy? That is just plain silly. It is far more likely that they realized it was a problem, devoted resources to getting it isolated, fixed, and tested. What's more, they knew the timeframe they had to work within. It is possible (likely?) they even had it fixed before the public revelation at the conference--it's good for PR to issue a fix in a timely manner (i.e. 24 hrs later). Let the media create buzz with this horrible flaw in the iPhone and then Apple comes to the rescue the following day.