Hah! One person already voted that they own a 6D... That should tell you something about polls in general.
All we can do now is compare specifications, wait for the camera to come out and for people to try it out and report on it.
At this point we don't know if the 6D's AF system is actually better than 5D2 (11 AF points vs 9 plus 6 assist points)... It appears only the center point is the dual-axis/cross type and the rest are single axis type... That's a step down from 40D, 50D, 60D, T4i and same as 5D2.
Or if the build quality is better (what's the shutter rating on 6D. It's 150K on 5D2)...
And we don't know how image quality compares (resolution is about the same and both are 14 bit). You can set higher ISO on the 6D, but that doesn't mean it's usable.
1/200 flash sync of 5D2 isn't all that different than 1/180 on the 6D.
I rarely use 1/8000, but it's nice to know it's there if needed.
I don't need more and fancier Scene Modes.
I do like that 6D allows for more than just 3 bracketed shots... 5 or 7 are possible.
Interchangeable focus screens... that means it doesn't have the active mateix/transmissive LCD focus screen of the 7D, 5D3, 1DX... That means no "grid on demand" in the viewfinder. It also means it won't have some of the new focus modes.
I'm glad it doesn't have a built in flash (helps keep it smaller, and might improve sealing against dust, moisture).
I don't care for the fact that 6D uses SD memory, don't need built-in WiFi and have no use what-so-ever for GPS built into my camera.
I wish it had an articulated LCD screen, 60D/T3i style.
Canon's goal apparently was to built a smaller, lighter full frame model that it could offer in the sub-$2000 price range (I know the initial price is $2100, but I be that will settle to under $2K within a year). 6D looks like a good effort. We'll have to see how it compares, once it's available.
At this point, I have no plans to replace my 5D2.