I think 6 might look something like that but I doubt they'll be changing the design that much for 5. They, and their, partners have invested too much in peripherals/accessories to abandon the current design so quickly.
Like others have said, it will be a 3G to 3GS style change this time around. Improved processor, camera and maybe capacity. There will probably be a big iOS update to make the 4 and 5 much better that won't be available to the 3GS. Thus forcing them to upgrade if they want new features.
That's the way Apple has rolled in the past.
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