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The Sub and SD have always been 40mm and similar in size(thickness)/appearance (obviously the SD is beefier). I see no reason for Rolex to change that now. The new SD will be thicker than the SubC so it will wear larger. The Sub, SD and DSSD will all wear differently.
Like Rashid said, there is no technical reason why the SD has to be bigger. I feel that most people would prefer that it be 40mm. Since Rolex is keeping it at 40mm, I think they feel the same way, too.
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