Interesting news from Sinar, as they have developed a front and back end solution for Leica S/S2.
There is now an adapter or Leica S Camera to Sinar P View Camera. It's very well implemented, including a revolving element for horizontal to vertical position change.
There is also support now in Sinar CaptureFlow software for Leica (via the Leica Shuttle). However, this is in depth software support, which includes camera control and ability to focus Leica lenses from the software interface.
CI will be getting a sense of the tethered capture performance today at the Sinar booth at PhotoExpo.