It just doesn't look they pivot, or pivot much...From the press release:
Each ear cup attaches to the headband through a revolutionary mechanism that balances and distributes ear cup pressure, and allows it to independently pivot and rotate to fit the unique contours of a user’s head.
EDIT: They DO. From the video Apple released, the ear cans SWIVEL on the stalk coming out of the bar that slides into the 'canopy'.
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