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They look like MTB rotors rather than Ultegra.
This all makes sense now - presumably not running MTB rotors but running the new DA rotors (although there appears to be zero difference).
https://www.cyclingweekly.com/news/product-news/tour-tech-why-are-pros-running-mtb-discs-and-is-that-a-new-set-of-shimano-wheels-467118Nice economy of scale for Shimano having to make two fewer types of rotor.
The wheels in that piece will be the new Ultegra ones too I'd assume.
Fox
They look like MTB rotors rather than Ultegra.