Apple has just released the sixth beta version of iOS 7 to developers for testing purposes. The update is available as an over-the-air update to existing beta testers and it can also be downloaded via Apple's Developer Center.
It was rumored earlier today that Beta 6 might be released next week, roughly two weeks after the release of Beta 5; however, the odd timing of this release -- Apple traditionally releases new iOS betas to developers on Monday mornings -- along with its small size, only 13.5MB on an iPhone 5, suggests that it could be some kind of urgent bug fix.
iOS 7 is scheduled for release in the fall of this year, with updates to Apple's iPhone and iPad lineups expected around the same time. If past history is any indication, iOS 7 should be made available to the public just a few days before the launch of the next-generation iPhone.
Update: Apple notes on the iOS Developer Center that the release fixes an "issue with iTunes in the Cloud, where some purchases may download or play unexpected items."
Article Link: Apple Unexpectedly Seeds iOS 7 Beta 6 to Developers, Update Fixes Issue With iTunes in the Cloud [Updated]