FotodioX has a new Pro PRONTO AF adapter that will let you autofocus Leica M lenses on Fujifilm X-mount cameras. The adapter was officially announced a few months ago and it is now available for sale at B&H Photo.
Additional information on the FotodioX Pro PRONTO lens adapter can be found here.
Similar adapters already exist for Sony E-mount cameras and the work surprisingly good:
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Via LeicaRumors, FujiAddict