iOS 5 Beta: Over-The-Air Updates Disabled on Jailbroken iPhones and iPads

Bad news for jailbreakers, the latest beta version of iOS 5 refuses to update itself via the new over-the-air update feature on jailbroken iPhones, iPads and iPod touches. The latest version of iOS 5 beta, dubbed iOS 5 beta 4 build 9A5274d, was released two days ago, and includes a slew of bug fixes, as well as the new over-the-air update feature that allows iOS to update itself without the need to connect iOS devices to iTunes. Moving forward, the feature will only work with non-jailbroken devices, as confirmed by the Dev Team:
It appears that by design, the OTA update that became available starting with iOS 5 beta4 will *not* be automatically applied to jailbroken devices. That’s a relief to those who don’t want to lose their jailbreak via OTA pushes. If you’re jailbroken, you’ll need to use the standard iTunes method to get to iOS 5 beta4. This is not for the very first time Apple is showing its anger to the jailbreakers. But what can we do Apple as we love to jailbreak you. Please don’t stop us from loving you!
The new over-the-air update feature helps keep iOS updates smaller, as only changes to the software are sent to the device, instead of sending the full blown operating system – the feature is very similar to Mac OS X updates downloaded via the Mac’s Software Update feature. As a result, the update weighs about 5 times less, and can be downloaded in a matter of minutes. Note that this new beta version of iOS 5 is the first iOS release to actually cripple jailbroken devices.