A week after the last update, Apple has delivered the tenth developer's beta for iOS 11 with unspecified changes since the last update.
The most notable changes in iOS 11 overall are ARKit, back-end enhancements and an improved voice for Siri, plus Apple Pay and Photos services enhancements. The Do Not Disturb While Driving feature was introduced during the second beta. The tenth beta of iOS 11 has build number 15A5772a, with the previous having number 15A5370a -- the same numerical increment between this and the last build as between the previous two beta releases.
Apple declared that its next release event is on September 12. All four of Apple's operating systems in testing are expected to be released on or around the release event, with a 4K HDR Apple TV, plus the "iPhone 8," "iPhone 7s," and "iPhone 7s Plus" likely debuting as well.