The FotodioX Pro PRONTO Autofocus Adapter for Leica M-Mount Lens to FUJIFILM X-Mount Camera is available at BHphoto here.
Down below you can see a video, where Fotodiox introduces the adapter and shows you how to double adapt lenses on the FotodioX Pro PRONTO.
List of mounts you can currently double adapt to the Pronto adapter
