You probably not have missed the news. It was announced in the first keynote of the Adobe MAX 2009 that it would be possible to export applications for iPhone from Flash CS5.
What I missed first is that it would be possible to export Flash applications for iPhone from Flash Builder and even using some parts of the AIR SDK. You can find this written in the Flash applications for iPhone Developer FAQ.
If you miss the first announce on Flash for iPhone, here the main links: