iOS 5 beta 6 build 9A5302b is just released by Apple and is now available for download. iTunes 10.5 beta 6 and Xcode 4.2 developer preview 6 are also released along to sync the latest build. The final iOS 5 will be released along with iPhone 5 in October.
iOS 5 beta 6 can be downloaded by members of Apple’s iOS Developer Program. It is recommended to take a back up of your device with iTunes 10.5 beta 6 or through iCloud, and then restore. The build is compatible with iPad, iPhone 4, iPhone 3GS, and the 3rd and 4th generation iPod touch models.