updated 01:45 pm EDT, Mon August 4, 2014
Apple TV, OS X Server, Configurator get matching updates
Apple is now seeding its fifth betas of iOS 8, OS X Yosemite, and Xcode to developers, as well as a preview of OS X Server 4.0, and fourth betas of new Apple TV firmware and Configurator 1.7. Relatively little is known about their content so far, although notes for the iOS 8 beta add that "spirometry data types are now available in HealthKit;" spirometry is the measurement of lung capacity. Xcode has received Swift-related improvements involving ranges and easier scripting.
HealthKit is intended to support a wide collection of apps and accessories, absorbing their data into a central location, iOS 8's Health app. The focus though may be on supporting the iWatch, which should have a range of health and fitness sensors of its own.
The new betas likely represent some of the last in the development cycle, since iOS 8 at least will likely ship next month alongside new iPhones. Yosemite may go live then or sometime in October.