Apple's Watch is designed to be both fashionable and functional.
Apple Updates App Store Guidelines, Calls Out 'Creepy' Apps for Exclusion
We have over a million Apps in the App Store. If your App doesn't do something useful, unique or provide some form of lasting entertainment, or if your app is plain creepy, it may not be accepted.The new guidelines, primarily in sections 25 through 28, outline what use of the new features would get an app rejected from the App Store. For instance, extensions must provide some functionality and must remain functional without network access. Keyboard extensions can only collect user data for improving the functionality of the keyboard and nothing else.
The sections for both HealthKit and HomeKit include guidelines for user data, with apps using HomeKit not allowed to collect any sort of user data for advertising and data mining while HealthKit is only allowed to collect data with a user's permission. TestFlight guidelines include limitations on distribution and compensation for beta testers.
Additionally, Apple added some notes to its Metadata section for the App Store's new app previews feature, noting that apps may only use video screen captures for previews and that app previews cannot display personal information without permission.
iOS 8 will be included on the iPhone 6 reportedly arriving later this month and likely launch a few days earlier for current devices.