The final DLC for The Last of Us' Season Pass will contain a new difficulty mode for the game's single-player mode, as well as new maps, weapons and skills for the game's multiplayer component. Naughty Dog only described the upcoming difficulty mode as "new," not necessarily harder. So who knows, maybe it's Lollipop Difficulty, where the infected have been replaced by fluffy teddy bears and sadness is replaced with rainbows. Naughty Dog wrote that they will provide more information "as in-game elements near completion."
Naughty Dog also released a new behind-the-scenes video detailing their journey creating Left Behind, the single-player DLC follow-up for a game with roughly a bajillion awards. We've included it after the break since, like the game's Clicker enemies, spoilers can rip your throat out make you have a very bad day if you get too careless.