Apple has released to developers a beta of iOS 4.3, the newest operating system update for iPhone, iPod Touch, and iPad. iOS 4.3 will include several feature upgrades including the addition of personal Wi-Fi hot spots, new multitouch gestures for iPad, and customizable messaging alerts.

Also included in the first beta of iOS 4.3 is the return of orientation locking by using the hardware switch on the side of your iPad. Users will be able to toggle the usage of that switch from its current function, muting, to the new orientation lock.

The App Store app has received a user interface makeover for downloading updates, and AirPlay functionality has been extended to third-party apps using new Media Player APIs. Web content can also be updated to support AirPlay when viewed on iOS devices.