Whoever put the image on is going to be under some scrutiny from Canon if they find out who it is. I'm surprised anyone who has the camera to test would take the risk but as they say, 'there's note funnier than folk' and there's always one person who thinks they can get away with something.
To be honest, you have to question their motivations as with the announcement only a few days away when everything will be divulged, why do it? Probably because they can and think it's getting one over on someone.

sad really.