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This happens all the time in manufacturing, and always has done.
Just that you don't know about it.

I know little things are fixed but a lighter/thinner frame with new display technology? Sounds more like a preview of the next model.
 
i think applecare+ can give you a refurbished unit for exchange, which means even if you did "accidentally" destroy your current iPad, there is little chance you'd get the fancy new better technology one. Which I sincerely, sincerely doubt will be released until next year.
 
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