David Anfossi, one of the of the Eidos Montreal said they have plans to release downloadable content for Deus Ex: Human Revolution after its release early next year.
When asked about DLC, Mr. Anfossi commented as "So you’re right, no multiplayer, it’s a single-player experience. It’s very important for us to deliver a quality game. And that fuels our energy. And yes, we started to work on DLC that will be an extension of Deus Ex: Human Revolution. Me and [Jean-Francois] Dugas, the game director, we started to work on that."
This third installment of Deus Ex will go on sale in early 2011 for PC, PlayStation 3 and Xbox 360.