Could be just me, but remember that false/ghey TFN report, neigh, 5 or 6 months ago where they had someone "draw" up the "first spoiler" image of grevious - and it basically looked like a vader pic and was, obviously now, a fake...
This image from the game looks pretty close-ish to it.
Then we got the reports at EP-X about Grevious having a "brain" exposed under some plexi-glass thing - which turned out to be fake, but then it turned up on his henchman...
So maybe those reports were right, the dude leaking the information obviously didn't know his grevious from his bodyguards...
Just an observation after the fashion...