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I am thinking there will be different types of build between the 7 and 7+. I am thinking that the 7+ could have a different build and slightly different feature set. Apple might call it a Pro model.
 
If it does have a glass body, I think the glass will be extremely thin, just for aesthetic purposes, covering an aluminum frame. I think this would avoid the heavier weight of glass while protecting the aluminum from scratches.
 
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