I may be completely wrong, but perhaps this is a reference to the way most apps will automatically stretch to use the full screen without needing any kind of update. Apps that play well with Notification Center can already compress a little to show a notification banner, I think. (I don't like notifications much and I disabled most of them, so I'm guessing based on stuff I've read mostly.) Basically, with toolbars at the top and bottom in many apps may use a fixed number of pixels, the content area in the middle can compress a little when a notification comes in, so that the notification pushes down the top toolbar instead of hiding it. That flexibility in the middle content area can be used to stretch the app to fill the new, taller screen without needing any kind of update to the app. Not all apps - or not all UI screens of all apps - work that way though, so some of them will probably have black bars at the top and bottom (or on the sides when in landscape mode). But a good chunk of the apps will probably work just fine with the new screen. I honestly can't recall where I read that. Probably Daring Fireball. Anyway, that's my take on the message.