No, I have no M plans by now... I use four cameras developed after Leica Ms, designed by people who used and loved Ms and wanted to go further, and made for M mount: two Bessas T, one Bessa R3A and one Bessa R4M.. I can't think of great new things any M could offer me, but I know what I'd miss if I used an M instead of my Bessas... For an older shooting style I preferred a Barnack over an M2... But I'd also play with a black M2 if I had some extra cash for that! During the last year I have wanted two things only: first, to be able to have fun with selective focus and a classic bokeh rendering with my Barnack, so I got the Jupiter-3, and this week, to get a cheap (Colombia) camera for fast (street) selective focus and with AE, so all I have to do is focus: for that, yesterday I bought a Yashica GTN: it's a black camera, goes to ISO 1000, and with its 45 1.7 lens, it will be discrete and fun outdoors (I won't have to take care of it in any way) and indoors too: in both cases for isolating subjects...
Some Russian lenses won't focus properly on Leicas, and some will, because they were made to different specifications depending on factory and year of manufacture... I think they were done in several different factories, and for close to five decades... My I-50 focuses properly on my IIIF (always) from 1 meter to infinity and from 3.5 on... My Jupiter-3 was optimized for focusing at 2-3 meters wide open... For great information on how Russian lenses behave on Leicas, you can explore the really enjoyable Brian Sweeney's threads, on his forum here on RFF...
Oh, talking about Barnacks, I'm about to receive an accessory I've been thinking about for a while, deciding which model to buy... I ordered this week from cameraquest.com a metal (silver) 28mm external viewfinder for my IIIF, just to be able to use my beloved and flat CV 28 3.5 on it: pocket size set! So now my Barnack basic set is complete: a flat 28 and a collapsible 50, both making a pocketable camera, and inside another pocket, the incredibly light (and small) Jupiter-3 (50 1.5) just in case I need speed or selective focus... That's what I'll bring with me to my US trip to Florida for the rest of this November... Oh, and the new toy, the Yashica GTN, for faster "bokeh" snapping...
Good luck with your decision!
Cheers,
Juan