While working on a sample app this morning, I noticed something completely new when using the Cordova In-App Browser plugin with iOS 9.
In the past, using this plugin just caused the selected link to open in Safari. There was no indication to the user on how to get back to the app that triggered the web page load. So, this caused a bit of confusion for users.
With iOS 9, Safari changes the status bar to show a link back to the app that triggered the web page load. This is a very helpful UX feature. Now, the user can simply tap the status bar to get back to the original app.