Naughty Dog will announce details regarding the first downloadable content for The Last of Us sometime this week, game director Bruce Straley said today on Twitter.
Ok party people, more #TheLastofUs DLC info to be revealed THIS WEEK! Hang tight.— Bruce Straley (@bruce_straley) September 23, 2013
Naughty Dog previously announced that two pieces of multiplayer DLC and a new story chapter will be introduced to The Last of Us through the game's $20 season pass. The single-player chapter will be released first.
The Last of Us has not featured any DLC yet, but patch 1.03 released in late August featured general tweaks, changes to the matchmaking system, and the addition of a new multiplayer mode called Interrogation.