The video above was released as a trailer for the Map Pack, which can now be found on the PlayStation Network Store for $10 (or free, if you already picked up the game's $20 Season Pass). The Pack adds a new DLC playlist to each of the The Last of Us' multiplayer game modes, including those introduced by prior DLC releases.
You can find a video overview of the 1.05 patch below, alongside a list of its major changes. This patch deals with minor balance changes on the game's multiplayer side, though newer players will be happy to see that the end result of these fixes should be a more friendly, inviting gameplay experience. If nothing else, fixing that bug that gave winning players awesome weapons while giving losers literal bits of scrap should alleviate a lot of player frustration.