Personally, I don't mind all glass phones as I think aesthetically they can look nicer. Plus, it would eliminate the need for those unsightly and awkward-framing antennae lines in the current design. And this could give way to wireless/contactless charging.
The one thing I don't like, however, is that it's just for one of the models? That's perplexing, if true. And might that mean only the glass model can do wireless/contactless charging?
Not the first rumor we've heard of that says Apple might be saving the best features for the higher end model. This whole "iPhone 7 Plus Pro" rumor is worrisome...