As predicted, it arrived a couple days early, for the iPad, iPhone* and iPod touch

Image: Apple Inc.

For a summary of the new features, see Apple’s AAPL press release.

Between downloading, backing up and re-syncing, the procedure took me nearly 20 minutes to update my iPad. When I checked, iMovie and Garage Band had not yet appeared in the App Store.

* For AT&T T iPhones only. Apple has not yet said when iOS 4.3 will be available for Verizon VZ iPhones.

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[Follow Philip Elmer-DeWitt on Twitter @philiped]