UPDATE 6.50pm: Sony has confirmed Uncharted: The Lost Legacy is a standalone game and will not need Uncharted 4 to play.

We have a new #Uncharted game! Uncharted: The Lost Legacy is a new standalone story chapter. Chloe Frazer and Nadine Ross are back! #PSX16 pic.twitter.com/womI6no3sj — Naughty Dog (@Naughty_Dog) December 3, 2016

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ORIGINAL STORY 6.10pm: Uncharted 4's single-player DLC, The Lost Legacy, is a side-story starring Chloe, Drake's ex-girlfriend from Uncharted 2.

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The reveal from the PlayStation Experience shows a woman in a hijab, later revealed to be Chloe, sneaking through a warzone, full of soldiers guarding checkpoints and clearing out cadavers. It looks pretty grim for what's typically a typically light-hearted series.

There's a new lockpicking mechanic and the emphasis seems to be on stealth though the reveal trailer climaxes with a rousing fistfight where Chloe is joined by a cohort in fending off creepy guards.