Leica would never outrightly state that they are not targeting the pro market. But it is simple numbers: there are more non-professional photographers in this world than there are professionals. And I daresay there are probably more non-professional photographers who can afford to buy this camera. I find it hard to believe that any newspaper, wire service, or photo agency is going to buy M8 and lens kits for their photographers, which for the most part are already using Canon or Nikon digital SLR gear, along with major investments in long glass such as 400 2.8 and 600 4's.
Leica would be thrilled if some professionals will buy and use the M8. Some may even be featured in Leica's marketing material for this camera (and in that case, those individuals/agencies could very well have gotten some deal on the equipment from Leica to use).
Twenty years ago up until maybe the end of the 90's the equipment used by photojournalists (to pick one breed of "pro" photographer) was quite varied. Leica M, R, Canon, Nikon, Olympus... medium format, etc.
Today, if the "pro" needs to deliver their images at the end of the day, they are most likely shooting either a digital Canon or Nikon SLR. For freelance photojournalists where work can be feast or famine, in the time that Leica (or anyone else) has not come up with this digital Leica M camera, many have sold off their Leica M kits (if the had them) and bought digital SLR equipment (or an Apple laptop).
Now that the M8 is soon to come out, how many of them can afford to repurchase those Leica lenses that they have sold? Also, many have gotten accustomed to shooting with digital SLR cameras since late 2001, when coverage in Pakistan and Afghanistan post Sept. 11 with digital was crucial in getting those images out to newspapers and magazines on deadline. During that time, I never met a single Leica M using professional photographer when faced with taking a job that entailed digital transmission (which entailed an SLR camera) to turn down that job. They had to adapt.
A photographer from one of the top agencies did a book on the fall of the Taliban and Kabul on a 3 megapixel Canon D30 (Canon's best at the time), and the man regarded as the world's greatest living war photographer was running around Afghanistan with a prototype Canon EOS 1D which was giving him horrible files due to incomplete firmware. But this is where the business was heading, and money was being spent on the two companies producing digital cameras that can be used in the field -- Canon and Nikon digital SLR.
Maybe if this digital Leica camera came out 6 years ago, the playing field would be different. But many rangefinder using pros have moved on to digital SLR cameras. But yes, some will buy the M8 if they can.
So I almost expect to see Leica advertising the M8 with photographers from Magnum. Better yet, find a Magnum photographer who has eschewed digital in favor of his or her Leica M6. Up until now, with the arrival of the M8.
The M8 will not be the bread and butter camera for the majority of professional photographers. Although I'd like to have one in my bag one day -- I was lucky to be able to afford to keep my M lenses.