Apple released iOS 5 beta 6 to developers today over the air and via its online Developer Center. The release is a 144MB OTA update and is labeled as build 9A5302b.
BGR has posted the complete change log noting that Apple does not recommend wiping your device prior to updating to beta 6, as it did with beta 5.
According to reports iOS 5 beta 6 can be installed OTA from devices that have iOS 5 beta 4 or beta 5 installed.
In addition to the new iOS 5 beta, Apple also released updated builds of iTunes (10.5 beta 6), Apple TV (beta 5), Xcode (4.2 preview 3) and iWork for iOS (beta 2).
Apple is expected to release iOS 5 and the iPhone 5 in early October although an official announcement hasn't been made.