The curved sides and front glass on the iPhone serve a purpose. When you hold the iPhone in your hand, you are squeezing it (unlike how one holds an iPad). The squeeze is far more comfortable with rounded sides. Then, as you swipe from the edge of the display a thousand times per day, the rounded glass makes for an unbelievably great feel.
Neither of these purposes that dictate the iPhone's design are applicable on the iPad. Therefor, any such design in the iPhone style would be purely aesthetic and serve no functional purpose.
Im not a fan of the 6 design personally. The curve makes it seem like the bezel is bigger. Im curious of what a iPhone5 design of the iPad would look like. Either way, perturbing camera is atrocious IMO.