There are but a handful of hours before the Leica M10 will be announced in Wetzlar. Leica Rumors have kept a tabs on what we know about the camera and what we can only guess.
While unlikely, the one thing that I wish for is an adjustable dual-stage rangefinder adjustment mechanism which can be easily accessed with a lens is attached to the camera. Flip the camera into live view, focus the lens to infinity, adjust for it, then focus it to close focus, and adjust a separate mechanism for it.
My M240 has gone whack only once. Thankfully, I live near Tokyo, which houses one of three Leica-approved rangefinder measurement devices. I waited 1,5 hours and paid about 3.000 yen. If I still lived in Canada, my camera would have to go back to Germany with a guarantee of being away for months.
Keep an eye out at Leica Rumors for up-to-date information.