There will be support for two distribution options using the WebView2 Runtime: evergreen, and fixed version.
Evergreen will be the recommended distribution model for most developers. In this mode, updates are pushed automatically to the WebView2 Runtime without additional effort from your application. The evergreen model ensures that your app is taking advantage of the latest features and security updates for hosted web content.
For constrained environments there will be support for a fixed version distribution model. In this model, your application selects and packages a specific version of WebView2. Updates to the WebView version do not occur automatically, and will be the responsibility of the application. The fixed version model is beneficial when you need to control the browser version, and when your application updates.