It seems Solebox, a German (Berlin) sneaker boutique is currently working with Sinn to produced a watch. I believe it will be a first for both parties and also the first time the Sinn U2 is being used as a project watch. The watch will be rendered in all black, i.e. black case, black rubber band and black dial. There are however orange accents on the dial and bezel. The Solebox logo will be at the 6 o'clock position.
The photograph below shows what we can expect the watch to look like. I will update this as we get more information.