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Naughty Dog finally announced the upcoming story related content for Uncharted 4 today. Entitled Uncharted: The Lost Legacy, this content will be a stand-alone product. You can either purchase it separately or enjoy it as part of the Explorer's Pack or as part of the Digital Deluxe Edition if you purchased either of those.

This story content focuses on Chloe and Nadine Ross. The trailer, shown below is from an early part of the game and is nearly nine minutes long.
Our video shows an early section of the game where we find Chloe in a war-torn city on her way to a rooftop rendezvous with her partner, Nadine Ross. Much like Chloe, Nadine is a formidable and interesting character whose complex nature we just started exploring in her Uncharted 4 debut. She’s a skilled tactician, whose cool, calculating nature offers an important contrast to Chloe’s improvisation and wit. As they venture deep into India’s Western Ghats mountain range, they’ll need to work together to recover the long lost Tusk of Ganesh.

When we began to plot out the story and our vision for the game, we realized we were building something more than an extension of Uncharted 4, and instead, a standalone story in the Uncharted universe. We wanted this adventure to feature all of the hallmarks of the series, from cinematic storytelling set within exotic destinations, to dynamic combat and intricate puzzles. It’s our biggest story expansion to-date and will be available as a standalone game on store shelves and for digital download.