[asafira]

Not that weird; I'm guessing the 720p camera module just couldn't fit. Lots of emphasis for this laptop went into "thin" engineering, and as should be clear with current smartphones, making thin but high quality cameras is a very difficult endeavor. (The iPhone 6 has the camera module jutting out of the case...)

[JohnnieWalker]

You would be right only that the Air is thinner than the new Macbook in the Camera area =) (0.11 vs 0.14)