Those of us who have playedBioShock 2 likely don't see anything out of the ordinary in the above image. Almost all of Rapture's propoganda has been smeared by Sophia Lamb and her followers in-game, so it only makes sense that 2K would do as much with the game's real world promotional items. And according to this thread on the 2K Games site, a black light is all you need to unlock this "hidden" feature in those neat posters you got with your Special Edition.
The forums users in the thread aren't yanking The Great Chain here, folks. Our sister site Big Download confirms the Easter egg in its Special Edition poster, as well -- there's even a gallery showing off all of the hidden messages to be found. Remember: a man chooses to display his BioShock 2 posters under a black light, a parasite complains about the increased electric bill.