The fourth beta of iOS 6 and Xcode 4.5 have been released by Apple (August 6th, 2012).

In this release you’ll find:
- SDK updates
- Xcode 4.5 Developer Preview 4
- iOS 6 Beta 4 for installing on test devices

As it relates to this beta:
- You can install the update OTA if you already have an iOS 6 beta installed
- Beta releases are for test/development devices
- You cannot rollback to an earlier release once installed
- Until the final version of Xcode 4.5 is released, you will need to use an earlier version to submit apps for review