You know, doesn't even look like a poster to me. More like a cover of a magazine or something. But like it's been said, people with lots of free-time could easily manipulate stuff like that.

And I will NOT accept this with as little proff that guy is giving.
"Today we received the confirmation, but it's not a game. Instead, we get the DVD movie Advent Children."
That's basically what he says, why in the Oglop's holy name should I just trust those words blindly?