Apple has released a beta version of iOS 4.3 to developers via the iOS Dev Center, bringing a few dozen bug fixes and features for the third and fourth-gen iPod touch, iPhone 3GS and 4, iPad and Apple TV.

Among the noteworthy changes is the addition of four and five-finger gestures including the ability to pinch to return home, swiping up to reveal the multitasking tray, and swiping left or right to switch applications. There's also a software option to change the iPad's side switch back to an orientation lock.

AirPlay, which was introduced in the previous 4.2 update, now supports video streaming in third-party apps and AirPlay functionality has been added to the Photos app. The Personal Hotspot feature seen on the CDMA iPhone 4 is present, as is a new FaceTime icon and support for fullscreen iAd banners.

Some users report that the gestures aren't functioning properly, so hopefully everything is sorted by the time 4.3 goes live. Boy Genius Report has published a changelog with various fixes, for Bluetooth, Wi-Fi, and Telephony, as well as the calendar, Exchange, fonts, keyboard, mail, messaging and more.