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That's not going to happen it will be called the iPhone 5 I'll bet anything on it look at the transition between iPhone 3G and iPhone 3GS after they brought the iPhone 4 so it's only logical the next will be a iPhone 5 :-)
How is calling the 6th iPhone the iPhone 5 even close to logical? They didn't call the 3G the 2 because is was the first 3G iPhone. They haven't released a 4G iPhone so I'd guess at that before 5 but my guess is any of these: