iOS 4.2 on iPhone 4 - First Impressions
As reported earlier today, developers have been given access to a near-final Golden Master (GM) build of iOS 4.2, with a general release expected soon.
It is highly unlikely Apple would make any changes prior to releasing the updated OS to the public, but not impossible - the Golden Master build of iOS 4.0 featured the Game Center app, while the public version released soon after did not.
As has been widely reported, iOS 4.2 is primarly aimed at bringing the iPad up to speed, features-wise, with the iPhone and iPod Touch families, adding a bevy of features including multitasking, printing and content streaming. However, that doesn't mean other iDevices have missed out.
