Why separate volume buttons?
This new iPhone uses separate buttons for the volume instead of the single button that you can find in the iPhone, iPod touch, or iPad. It's one of the factors that may indicate that this is a provisional case, until you think about one of the most requested features for Apple's phone: A physical button for the camera. The new iPhone has a bigger sensor and a flash, which means that the camera function keeps gaining more weight. It's only logical to think that Apple may have implemented this two-button approach to provide with a physical shutter button. It makes sense.