I've been mostly reading along. This thread seems mostly composed of those who would never buy the camera anyway, and those who accept it for what it is, but simply aren't interested.
And now for something a bit different, the perspective of a current 6D user, who thinks the 6D is great camera.
I got my 6D shortly after it was released. Keeping in mind the camera's limitations, it is the right Canon body for me. Really good IQ, easy-to-use controls, dead accurate (crippled) auto-focus, smaller/lighter/cheaper than the 5D series. The 1/4000 and 1/180 limitations have never caused me any problems. That said, the 6D is not much of an AI-Servo camera. That is its biggest limitation for me.
After a few conniption fits with finding the right AI-Servo camera for me, I ended up with an 80D. A full frame 80D would be the right camera for me. Though the pixel density is a bit much for shooting at f/11-16 with my wide stuff. I like the 6D's DLA of f/10.5.
The 6DII has all the limitations of the 6D, except the crippled AF. Before this body was released, my only path to having just one camera was the 5D4. Making the move from 6D+80D to 5D4 would cost me about $1700 net, and require learning new controls. Making the move to the new 6D2 would cost me only about $400-500, and I get the controls I am used to.
All of this begs the question: Why bother spending anything only to get all the features I already have? Now I just need to weigh the cost of upgrading two bodies to one body, with essentially no increase in features/abilities. The 6D2 certainly takes the 5D4 out of the picture. Still not sure about my need for the 6D2.