iOS 6 Golden Master released to devs
It's all happening now. We know the devices, and we know the official release date of iOS 6, and now the final build of Apple's new mobile OS has been released to the developer community, so the critical work of updating apps and building new apps can begin in earnest. This will give developers exactly one week to work before iOS 6 is released to the public.
There are a number of new features in iOS 6, some them are not really all that new, and not all will really be of use to the average developer. The number one feature that we should see making its way into the majority of app is the new Facebook integration available. And, of course there are all of the new tools that can be built to hook in to Apple's new Maps app.
If you're a developer, just head over to the Apple Developer Center to find all of the tools and software you'll need to get to work.
source: Apple iOS Developer Center