Assisted selfie taking with high res back camera

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I love this idea. I wish someone would go one step further and create a case with a screen on the back so that you could see yourself with the high res back camera.
The problem with taking a selfie with the high res back camera is that you can't see yourself. This clever app voice directs you to guide your mug into the frame. "Right, left, up, down.... snap!"
Seems good. But will this be necessary with the iPhone 6S and its great front camera?