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Which seems to me to make a lot of sense. The cables from an internal battery to the FD and RD are the easy bit. The faffy hard bit is the cabling from the shifters, but they're the bits that need the last power and so are easiest to make wireless. In some ways I think it's a rather elegant solution. Trouble is, it's FSA.
Brommers
Sumo
only the shifters are wireless, the derailleurs are linked to each other.