While the Apple Watch has fostered wider interest in wearables, its arrival has also prompted renewed questions about how valuable wearables are and how much they could undermine privacy.

At its World Wide Developer Conference (WWDC) next week, Apple could provide a glimpse at how its latest invention has done since Apple Watch sales started in April. Apple is also widely expected to add rewards capability to Apple Pay, its mobile payment service that works with recent iPhones and the Watch.

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