The only option listed there that is available on the M6 coupe in ANY world market is High Beam Assist. I would expect the same to be true of the convertible. I wonder if High Beam Assist is not available in the US due to some obscure regulation.
The convertible is produced in much smaller numbers so I'd be surprised if they were going to make two completely new seats.
I think it unlikely that they will ever come to the M6 because the convertible uses a totally different seat to the Coupe, and the volumes won't be big enough to justify it. Don't forget the M5 sells in much higher volumes than the M6.