iOS 7 Beta 6 May Be Out on August to October, 2013 - Just Before Golden Master Version - Rumors :)
According to various technology sites, iOS 7 Beta 6 download might be launch on August 12th or Sunday, October 6, 2013 but well know iOS Developer/Hacker iH8Sn0w he think that iOS 7 Beta 5 will be died on Sunday, October 6, 2013 @ 12AM (GMT). This news came out on Twitter.
As I mentioned above there is no time-frame confirm about iOS 7 Beta 6 Download might be arriving August 12th to Sunday, October 6, 2013. There is not a single website which share accurate time-frame yet that Apple will do similar thing which it did previous. I think now there is not pattern for iOS 7 Beta 6 because Apple has shocked everybody with rapidly release iOS 7 Beta 5 this month week. There are plenty informer who think that iOS 7 Beta 6 Download will be operational in couple of weeks and this time it will release minor modification update of iOS 7.