Square Enix reveals a new DLC called Missing Link will be coming to Dues Ex: Human Revolution.

Here is the post from their official site:

The Deus Ex: Human Revolution conspiracy grows deeper in The Missing Link. During Adam’s quest for the truth in Deus Ex: Human Revolution, he mysteriously vanishes for three days. Where was he? What did he find out? The Missing Link reveals it all.

After being tortured by Belltower agents and having his augmentations disabled, Adam Jensen must rely solely on his basic capabilities to escape from a freighter, destined for an unknown location. While fighting for his survival on the ship, he uncovers another layer to the conspiracy that he never would have suspected. As Adam, befriend new, mysterious allies and fight ruthless enemies to discover what was happening in the shadows during the events of Deus Ex: Human Revolution!

-New layers of conspiracy unveiled
-Sprawling new environments
-Brand-new characters to interact with
-Rebuild Adam’s augmentation set from scratch. Build up a brand new Adam!

What is The Missing Link? You’ll find out soon.

So it seem like we will get to find out what happened to Adam during those three days when he was trapped on a freighter.