Shimano's Patent Reveals Direct-Mount Electronic Derailleur Design.
Shimano has been granted a patent for a wireless electronic derailleur that will use a direct mount. The patent describes a derailleur that can use some form of direct mount, and is wireless and electronic. The drawings depict one version where the derailleur is mounted close to the chainstay, and the other where it uses a link that's similar to what Shimano used when they last tried to get a direct mount system off the ground back in 2012.