Releasing in January, 'High Tide' takes place where the original chapters left off, concluding the story of Leonard, Tisha, Mikhail and Callum.
The chapters, titled Jailbreak and Redemption, are described as "the best of the best" and promise new missions, tougher fights and bigger competitions.
Exact dates and prices are still to be revealed.
Announced by Ubisoft last year, Far Cry 3 returns to the tropical setting made famous by the first Far Cry.
The game's four-player co-operative mode takes place six months prior to the events of the single-player campaign.
Ubisoft recently released a trailer exploring the origins of Vaas, the game's most memorable antagonist.
Far Cry 3 is available now on Xbox 360, PS3 and PC.
> Read Digital Spy's 'Far Cry 3' review
Far Cry 3 screenshots - view a selection of Far Cry 3 images below: