Deus Ex: Human Revolution - DLC Hints?

If you've been playing DX:HR, you will have seen the scrolling note at the bottom of the game menu directing you to a special "message" at their website. That turned out to be a code-breaking excercise that I don't have the time for, but VG247 claims it's all about an upcoming DLC:

The DLC follows events of two days spent onboard a ship. The player is isolated from the support networks found in the core Human Revolution game, and must face events independent of comm advice.

While travelling, the player discovers the vessel is a floating prison of some kind, and that experiments are being carried out on the inmates. Environments include plenty of cells and a sentry tower.

It’s not clear whether the DLC is an event tied to Human Revolution’s plot, or part of the broader Deus Ex storyline – perhaps an episode from original protagonist JC Denton’s adventures, which would explain Eidos Montreal’s promotional build up.