As rumored, Apple has just pushed out a fourth beta version of iOS 7 to developers for testing purposes. The update is available as both an over-the-air update for the existing beta testers and through the iOS Dev Center.

The version contains bug fixes and improvements
For more details, visit http://developer.apple.com/ios7/release-notes/

The build is 11A4435d.

Apple has also released Xcode 5 Developer Preview 4 and a third beta of the Apple TV software is now under development.