wilsonlaidlaw: I am a Leica enthusiast. I have used Leicas since the 1950's and currently a IIF, an M4 owned from new and M8 and M9 cameras. Will I buy the monochrome - no not interested. The images have the plasticy look of chromogenic film, which I don't like.
If I want B&W, I have more than enough film cameras to use or I can use my M9, where I can post process the colour RAW/DNG in CS6 to get the effect of filters. Having to screw filters on and off is IMHO one of the things that most gets in the way of creative RF style photography. I quite enjoy creative filters with DSLR and have a set of Cokin P filters but that is a different activity, usually on a tripod.
On the assumption that the M10 will have a lower noise CMOS sensor with maybe 28MP or more, I would guess that it will be difficult to tell a converted B&W from that camera from that made by an M9M.......and guess what guys - it takes colour as well.
I just see the pictures on leica web. They are different from here. I like those there.