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danb-
Apparently they released this: https://www.bike-components.de/de/Shimano/Y-Kabel-Verteiler-EW-JC130-fuer-Dura-Ace-Di2-R9150-Modell-2017-p51473/
Jaap
in other news, this is now available:
https://www.bike-components.de/en/Shimano/Elektrischer-Verteiler-EW-RS910-fuer-Dura-Ace-Ultegra-Di2-Modell-2017-p53775/
apparently it's a 2 port design.. how the hell are you gonna connect 2 shifters AND have a wire go to the rest (battery and derailleurs)!?