I just read through dpreviews preview of the Canon EOS 6D. I'm not particularly impressed with this camera...I was really hoping it would get a better AF system and maybe a better sensor, to indicate Canon IS indeed capable of competing. I'm not sure I really believe Canon can dig themselves out of the technological hole they are in regarding sensor technology...but I guess only time will really tell.
For all the nay-saying in general about the 6D, there do seem to be a couple really nice things about it. For one...its f/2.8 AF point is sensitive down to EV -3. That is, as far as I know, pretty unheard of. Most low-light AF cameras work down to EV -2. Canon seems to be positioning this camera for low-light AF accuracy, not AF speed. Thats all well and good...but it is rather disappointing to see it competing against Nikon's 39pt AF system in the D600.
The two true gems, though, are the BULT IN (YEAH!!!) GPS and Wi-Fi. No need for a adapter for either, no need to choose one or the other...both are built right into the camera body! Now that is pretty sweet, if you ask me...and about damn time! Canon may not have modern image sensor tech and may have lackluster AF systems in most of their cameras, but seeing them include built-in GPS AND Wi-Fi is a nice change of tactic. Maybe they still do have a smidge of competitiveness left in their ailing bones...