I installed iOS 8 on my iPhone 5S today and the got the Health app as a result.
It shows on the Health app that it can get data when the app "sends" data over to the Health app. So I assume Nike Running (an app from Nike) probably has that built in? If so, how can the running / walking data be sent over to iOS 8's Health app?
P.S. ok, I saw news headline such as: Apple seemingly removing HealthKit compatible iOS 8 apps from App Store due to issues, and Apple's health monitoring app is DOA: Firm forced to stop apps from using feature as it admits to iOS 8 bug