It's based around a level from the core game's solo campaign, but this time Ajay can team up with his (annoying) co-op buddy Hurk to scavenge weapons and ammo, and complete a series of challenges in a vaguely roguelike structure in order to escape.
"After Ajay and Hurk wake up in Yuma’s prison, stripped of all their weapons, they will need to complete challenges to find new weapons and unlock skills," Ubisoft explains. "Take your time to plan and be careful, but not too much time because the clock is still ticking and you need to reach the extraction point."
You can play the new mission solo or co-op, but you only get one chance at it. "Should you die, you will have to start the mission over again, but this time you’ll have all the knowledge and skills you gained in your previous attempts," says Ubisoft. It's an interesting direction to take Far Cry 4's combat in, encouraging stealth and planning over rocket-launching everything in the immediate vicinity into giblets. Weapons and gear you manage to secure before dying will be available when you restart the level. There will be global leaderboards for the mission, if you're the competitive sort.
If you own the Far Cry 4 Season Pass, you’ll receive Escape from Durgesh Prison for free, but it can also be grabbed independently for $9.99 when it launches on January 13.