iOS 4.3 for the iPhone is delivered a couple days earlier than anticipated
With that said, you can connect your iPhone to iTunes and begin downloading the latest version of the platform where you’ll them have the opportunity of experiencing first-hand all the new exciting set of features it has to offer. Specifically, it host things like mobile hotspot functionality, faster Safari performance, new AirPlay features, and the ability of getting HD video out using the Apple Digital AV adapter.
Furthermore, it also includes some of the customary set of bug fixes that will iron out the some of the kinks with the platform. Overall, it’s definitely an exciting new update that will get you all giddy while you wait for it to install on your iPhone or iPod touch.
source: Apple via Engadget