The November is here and Apple kick started this month by seeding iOS 4.2 Gold Master build to developers. It has been long wait, back in September Apple seeded first beta of iOS 4.2 and now after two months Apple is almost ready with iOS 4.2 final release. iOS 4.2 GM build will be the final release if no bugs are found.
With iOS 4.2 Apple iPad will get multitasking & app folders another noticeable new features are Air Print & Air Play. If you are registered user of Apple developer program and you can go ahead and download iOS 4.2 GM build using below link.
If you rely on jailbreak & unlock then you must wait until dev team of comes up with jailbreak soliution. Yesterday’s released Redsn0w 0.9.66B2 is capable of jailbreaking iOS 4.2 GM but you should wait for apps to be updated for iOS 4.2 compatibility.