This system will be released into the wild as soon as Google's done working on it - which doesn't appear to be all that long from now.
That's just the beginning - it requires a smooth system to run in order to be adopted, and indeed accepted - by users worldwide.
As such, Google suggests that Android Instant Apps will "Run Android apps as seamlessly as loading a webpage."
Perhaps just as important as the speed at which these app bits open is the fact that this will all work on Android devices on Android versions as old as Jelly Bean.
It's a system that lots and lots of smartphones are still running today - we can't all be Nexus users.
Google's next step is, of course, allowing you to see just that one tiny portion of the app with the option to download the whole thing.