It's the same process as updating your app. The "updated" (new feature) version of your app will have all the same files as the old version of your app plus whatever new folders. See: Walkthrough for your first time using wyBuild.
Install New Feature Instead of Updating Product
Is it possible to use wyUpdate to add additional features (in the form of a new subfolder in the application, for example), instead of updating the whole application from 1.0 to 1.x?
That's not what I'm asking about. This is not an "updated" version of the app, but rather an "add-on" of sorts that becomes newly available.
Will it be released to all users?