According to WABetaInfo, a fan site that tests new WhatsApp features early, the feature is current under development in Beta for Android 2.19.3 version
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"The user will need to authenticate his identity in order to open WhatsApp (from the app icon, from the notification or from external pickers). It will protect the entire app, so it's not used to lock specific conversations," the report added.
This feature would be available in future for any Android user (and later for iOS users too) having Android Marshmallow and newer operating systems and a fingerprint sensor.
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