I would more suspect that Superman is just cooperating. He's a cooperative guy.
I'm not a fan of this poster. I really want my Superman to exude hope and inspiration. Not be in handcuffs. I won't judge the movie until I've actually seen it, but as a first poster, while it's interesting, it doesn't give me hope that it'll be the kind of Superman movie I want.
This was NOT released by the MAN OF STEEL FB page...it was released (for some strange reason) VIA the DARK KNIGHT RISES FB page....neither the MAN OF STEEL official site nor their official FB page has the image.
And that's why I'm calling fake.
All the news sites like BC have reported this is official, meanwhile neither of the official outlets for the production released it.