Apple has just released the golden master version of iOS 4.3. iOS 4.3 includes personal hotspot, a faster Safari engine, new AirPlay features and more. The public release of iOS 4.3 launches March 11th alongside the iPad 2.
The update is available in versions for the iPad, iPhone 4, iPhone 3GS, and third- and fourth-generation iPod touch, while the iPad 2 will of course also ship with iOS 4.3 installed.
The new 4.3 firmware will include many new improvements, including enhanced AirPlay and Personal Hotspot support.
If you are a paid developer, head on over to the Apple iOS developer site to download your SDK and firmware. You will need to sign in with your credentials in order to get behind the paid firewall for these items.