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So there is a possibility that the EOS 6D may have a 19-point AF system after all. 11 selectable, 8 non-selectable, and 3 high precision with f2.8 lenses.
Note that this is a possible AF point mapping. It's not been confirmed by Canon.
The AF sensor, though, shows that the center AF point has been beefed up quite a bit.
So, auto focus with only the center AF point should be an improvement over the 5Dc/5DII.
Maybe more so if those hidden AF points are active all the time.