Will the iPhone 6 / iPhone Air have curved glass? Or is it just an illusion in this photo..

Here we can see an iPhone 6 / iPhone Air Dummy Prototype with a curved display, or is that an illusion in this photo because of the angle? I think it looks like it has a bit curved display, and it's quite logic if Apple doing it a bit curved so the bigger phone will be easier to handle with one hand.

The photo is posted on Twitter and also comes with a photo showing the back of the same dummy unit.