According to Macworld, Apple will release iOS 4.2 to eager customers at 10 AM PST today -- Apple's press release simply says "available today." The much-anticipated update was supposedly delayed several days ago due to Wi-Fi issues with the iPad. A new gold master was subsequently released to developers and it would appear that the rest of us will get the final version within a few hours.
Today's release will mean Apple has met its November deadline. We'll have full coverage of iOS 4.2 throughout the day, so check back for the latest!