Comment by flokie

It seems pretty clear that's what you get when you use the campaign? https://support.google.com/googleplay/android-developer/answ...

"After you make an app or game available for pre-registration, users can visit your store listing to learn about and pre-register for your new app or game.

Then, when you publish your app or game later, all pre-registered users will receive a push notification from Google Play to install it.

Eligible devices will also have the app or game auto installed on the day it launches. (more details on this in documentation)