I'd really love it if they could somehow make the whole back from a single piece of something. It could look more minimalistic than it does now with the iPhone 5, that has two seams at the back and quite a few seams at the edges in the aluminum frame. All this because antennas can't transmit through aluminum, which is why plastic or glass seems like a great solution. Though glass can't be nice and curved like it was with the 3G/S, so it needs a metal edge, which adds yet another seam.
Plastic allows truly 2 parts for the phone: The screen + The back. The problem is that it needs to be a bit thicker to be strong, but at least it's more flexible and resistant to drops. I think that the 3G/S now feels very chunky and big, and quite hollow (bigger than its weight would predict). Don't know if that's because of the plastic back, or something else, but I guess it's probably related.
I absolutely love the stainless steel back of the old iPod Touches, I think that looks amazing and feels even better: strong and heavy and looks great. Thin aluminium feels a bit too thin and hollow. Glass feels right but it was very square and not so comfortable on the 4/4S. The iPhone 5 is so thin it doesn't really matter, but I think that the 4th Gen iPod Touch (or whichever the previous one was) is the perfect design: Thin, stainless steel back with tapered edges, to make it feel even thinner.
Plastic allows truly 2 parts for the phone: The screen + The back. The problem is that it needs to be a bit thicker to be strong, but at least it's more flexible and resistant to drops. I think that the 3G/S now feels very chunky and big, and quite hollow (bigger than its weight would predict). Don't know if that's because of the plastic back, or something else, but I guess it's probably related.
I absolutely love the stainless steel back of the old iPod Touches, I think that looks amazing and feels even better: strong and heavy and looks great. Thin aluminium feels a bit too thin and hollow. Glass feels right but it was very square and not so comfortable on the 4/4S. The iPhone 5 is so thin it doesn't really matter, but I think that the 4th Gen iPod Touch (or whichever the previous one was) is the perfect design: Thin, stainless steel back with tapered edges, to make it feel even thinner.