Don't worry; there won't be a shark fin but there will be an antenna in the centre of the trunk... but at least just one! And yes there will be a key lock necessary in the trunk. And no, the rear end of the car is not changed from the coupe... the bumper and lights and sides of the fenders etc are all the same.... all the changes are on top of the trunk-lid and fenders etc. And yes I agree the coupe is a lot nicer looking... making the convertible involves cutting off the most beautiful part of the car (unlike the Vette).
I've known how to spell Camaro since before you were born.