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It's possible, but no one really knows. Perhaps after a few more betas we'll be able to get an idea, but we'll know it's within a week or two when we get the iOS 6 GM seed.
 
Since version 3, iOS has been released 2-3 days before its "companion" hardware. I'm therefore going with "yes".
 
It might be available before the iPhone 5 goes on sale, but it will likely be "released" at the same keynote.
 
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