But, I would not make the >assumption that any other Nikon body uses tempered glass.
I don't know about other bodies, but with the glass flush to the surface, and no protector provided, I think Nikon is absolutely inviting owners to assume that "Gorilla Glass" is installed on the D7100.
Personally, I think it's another of the great finishing touches on the camera.
I loved my GGS glass overlay for the D7000, which looked like an OEM product (and allowed a view far better than the snap on protector). But I'm leaving my D7100 au naturel. I believe it was designed for that approach.