iOS 4.3 coming March 11

In addition to announcing the second-generation iPad, Steve Jobs also announced that iOS 4.3 would be released on March 11. The new update for Apple's mobile operating system includes enhancements to AirPlay, the Nitro JavaScript engine for mobile Safari, and the addition of the iPhone 4's Personal Hotspot feature.

"With more than 160 million iOS devices worldwide, including over 100 million iPhones, the growth of the iOS platform has been unprecendented," Steve Jobs said at teh iPad 2 launch. "iOS 4.3 adds even more features to the world's most advanced mobile operating system, across three blockbuster devices devices."

Jobs said that enhancements have been made to Apple's AirPlay service that allows users to stream video from third-party websites and apps to Apple TV. Users can already stream music, photos, and video to Apple's set-top box. Jobs said that users can now also stream photos in slideshow format, and watch user-created videos on Apple TV from their Apple device using the Photos app.

Websites should load even quicker on mobile Safari, thanks to Apple finally integrating its Nitro JavaScript engine to the mobile OS. The engine, which was recently added to Apple's Webkit, will allow pages to load twice as fast as they normally would due to "just-in-time compliation."

Apple is also integrating its CMDA-exlusive Personal Hotspot service to all of its mobile devices. The move to quickly add the service to all of its devices is largely due to similar services being offered on other phones and tablets.

iOS 4.3 will be available on all Apple mobile devices except for Verizon's CMDA iPhone 4, which uses a different baseband chip than the other devices. The phone currently operates on iOS 4.2.5, but will probably be updated to an 4.3-equivilent in the near future.