>> Seems difficult to predict just what will be "current" in the digital world two years down the road. Isn't that like 4 generations in digital-speak?<<
I think digital sensor technology is actually getting fairly mature. Once you're in the 10 megapixel range with stable onboard processing firmware, you have replaced film in nearly all 35mm handheld shooting situations at which a small camera excels. (If you're into tripods, your images would be vastly superior with medium format film). Aside from the sensor, current DSLR and DP&S technology is centered around special operating modes, variants and innovation with SLR viewfinders, rapid sequence shooting and new concepts for controls, form factor and handling. While these are intriguing, I think most digital Leica customers would be looking for a classic camera layout with minimal intrusion from the digital technology. They want a camera that operates in a time-tested fashion while capturing on modern media. So to some extent, the digital-M should be immune to rapid-digital obsolesence. A 10 Megapixel image will still produce excellent images 10 and 25 years from now, barring any unforseen leaps in the evolution of the human eye.