From henceforth you can now pre-register for unreleased or up-coming apps on Google Play Store. When this is done, you receive alerts concerning the app, release date and other relevant information. There’s also an option to opt-out (Unregister) from getting the alerts.
The Terminator game above is the first in the store to implement this feature. This feature can also help developers to check interest from their app before it’s released.