Apple has released iOS 5 beta 3 for iPhone 4 . This third beta release contains security fix and stability improvements for iPhone , iPod Touch and iPad . The iOS 5 ipsw files can be downloaded from Apple Dev Centre [link below] . Apple also released iTunes 10.5 Beta for Windows and Mac .
Supported Devices :
iOS 5 beta 3 build 9A5259f release date July 11 2011 supports iPad 2, iPad (1st generation), iPhone 4 (GSM-CDMA), iPhone 3GS, iPod Touch 4 , 3G and Apple TV 2G.
Read more about iOS 5 Features .
Update : It is expected that Apple will release iOS 4.3.4 following JailbreakMe 3.0 release to fix the PDF Security exploit used by iPhone Dev Team to jailbreak 4th generation iOS devices including iPad 2 Jailbreak . Make sure you don’t update with iTunes as you may loose your present jailbreak .
If you have already jailbroken , the PDF exploit security vulnerability can be fixed using free jailbreak tweak named PDF Patcher .