Seriously, does anyone believe in 6D? All of these have been anonymous web "tips", aka wishful thinking. Canon will not release a cheap FF until either 5D3 sales stop, or Nikon officially releases and proves that cheap FF will take off enough to make money.
Canon might very well preempt Nikon this time, and after all they named the 5d3 as it is because it replaces the 5d2 and not because they'll produce the predecessor forever.
The simple fact is that the pressure from below (all the aps-c with the current 18mp sensor) is building up, so Canon has to do something in the $2000 region. They cannot come up with an really improved aps-c sensor, that's why they released the hyped 7d firmware update to keep it alive. So they have to do something in the 5d2 ff region or lower the 5d3 price significantly - unfortunately, the latter is unlikely.
For me, the only question is how dumbed-down a 6d will be - plastic body, much less customizations, no c on the dial, no afma :-> ?