Deus Ex: Human Revolution's first pack of DLC is called The Missing Link. Gamers will get to continue the story of Adam Jensen in the form of additional missions this October.
The Missing Link fills in a gap that takes place towards the end of Deus Ex: HR. I'm told there were a few days that are unaccounted for somewhere in the plot and that's where these missions take place. I'm not being cryptic, I'm just not that far into the game myself so I don't know what I'd be spoiling. Confused? Good, so is Adam Jensen.
After completing The Missing Link, gamers will uncover even more of the game's mysteries. There will be "more details coming soon," according to the Square Enix official blog.
Source: Square Enix