If you have an Apple Developer account, iOS 5 Beta 4 is available for download. While changes in this version aren't immediately clear, there is one new feature Apple was certain to mention: you can update your iOS device over the air.
To properly update your iOS device sans wires, you need to make sure that you have iOS 5 Beta 3 already installed. From there, it should be as easy as going into the General section in the Settings menu of your iPad/iPhone/iPod and checking for an update. Happy experimenting. [Boy Genius Report]