Mostly in this and similar threads, plus some conversations in the Meze room at this years London show. In short, Meze trialled a variety of finishes on pre-production models. I'm aware of black, copper and silver for the grill colour, but there could have been more, (Black is my shorthand for a dark grey/gun metal colour that Meze clarified recently in this thread). For the production models, Meze chose black for the first 2 runs of 500 each. They haven't stated what colour the 3rd batch will be, so some of us are putting in our votes early for copper to help them make the correct decision It's only the grill that changes, not the whole headphone, so hopefully Meze will gain confidence to add different colours depending on how fast the first 2 batches sell.