iOS 4.2 GM for iPhone, iPod touch, iPad released to developers

Now we know why Apple didn't release an updated iOS 4.2 beta for iPhone, iPod touch, and iPad last week -- they just released the GM (Gold Master) for developers. This is the typically the final version given to developers ahead of time so they can test it on their apps and make sure everything is working before the release goes public.
No word yet on what if any changes or new features might have snuck into this iOS 4.2 build, but if you come across any let us know in comments or drop us a line.
Check out our complete iOS 4.2 beta walkthrough for the features so far.
UPDATE: AirPlay is still audio-only to Apple TV. Maybe iOS 4.2 for Apple TV will be required to enable that? There's a new AirPlay icon, however, and the multitasking dock has even more functionality than before. Pics after the break!
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.