I just received an answer to my question from two days ago – soon you will able to use your Leica M lenses on the upcoming Fuji X-Pro 1 mirrorless camera. Fuji will announce their own M-mount adapter for the X-Pro 1. The price of the X-Pro1 body is $1.699. The camera will also have two optical magnification options: x0.37 for wider lenses and x0.60 for other lenses.