In all honesty, it should be called the iPhone 6. But the mass idiot consumer base would get all confused if they did. It only worked the first time around because "3G" was a technology that happened to have a number in the name. What they'll probably do is dumb it down and just call it "iPhone," like they did with the iPad. Lowest common denominator for this group.
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That's completely subjective, of course, and I for one don't happen to agree.I really can't see why they would go with a panel in the middle and then have glass at either end - that's just dumb and it looks pretty crappy in the photos we've see so far.