The Google Play Store is rolling out the ability to auto-download games or apps that have been pre-registered by a user, when available. The feature was spotted in a teardown back in January.
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Google Play Store Update: New Android apps may automatically get downloaded if you register before launch - Times of India
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Google Play Store starts letting users auto-download pre-registered apps and games - Neowin
Why does Google Play keep installing apps on its own? - Quora