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I predict 2 front facing cameras or 2 rear facing cameras and 3d imaging software builtin to the iPhone 6 or iPhone 7

That's already out there, I think HTC EVO has it, and it is amazingly boring.

When HTC EVO does it, a TINY focused number of people get to play with it.

When apple puts it into their one premiere phone, millions of people will have it and interesting 3rd party software is worth making then.