Possible Progression of the iPhone's Design

I listened to John Gruber's weekly talk show's podcast recently, and he and Craig Hockenberry mentioned an idea that I had also entertained for some time now: that the new versions of the iPod Touch could be what the iPhone looks like in a year or two. They both made the point that Apple probably sees the iPod Touch as a way to "test the waters", design-wise, and see how a future iPhone might be received critically. It's a theory that makes sense to me, especially the part about how the new and colourful iOS 7 interface could have colour schemes, which would work with future iPhones with colour options, not unlike the current iPod Touch generation.

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[via Apple.com]

I'm a huge fan of the iPhone 5's design - it's probably the primary reason I upgraded from my iPhone 4 to one - but I'm a bigger fan of the iPod Touch's design. At this point, it's pretty clear Apple has a thing for achieving as little thickness as possible when iterating product designs, and is only usually hindered by ensuring that the battery levels of the previous generation be maintained, at the very least. If battery technology can be improved significantly, I wonder if Apple will push the thinness of the iPhone even further. Mind you, it's not as if the iPhone 5 isn't already thin enough for most people; will we see the first image below slowly evolve into the second?

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[via Apple.com]

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[via Apple.com]

Then there's the design of the back to consider as well: with the iPad Mini (see below) and new iPod Touch sporting similar back designs, there's a chance the future iPhone could go from having a Slate back with upper and lower black glass bands, to having a completely slate back with no glass.

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[via Apple.com]

Maybe I'm just bored (I tend to hate Sundays and their slow news), but what do you think?