Yes. Camera cut out location was moved at some point. I believe it was from the 6S to the 7 if I'm not mistaken. As a result, the cases for the 6 won't fit the 7 or 8.
What they said ^^^
Along from the cut out being a different size they also removed the plastic ring around the opening.
Also went from leather side buttons to metal which should be much nicer.
But as far as size and weight they should be the same.