It sure does look like a bracelet in those shots, but I think it may be a watch with the face the wrong way round. I only say that cos in the first official shot it looked like the Doc was wearing a gold watch on his left wrist.
Maybe the Doc wears the watch the wrong way round so that he doesn't have to look at 'Time' all the time. As if he actively chooses to wear a watch, but then can't stand looking at it. It'd be a nice way of summing up the conflict within and would be a nice concept if that was the intention.
EDIT - Although with the amount of running involved in Who, maybe it just slipped round and I'm overthinking things.