"To create something fresh but familiar, we looked beyond Jin Sakai’s story and the island of Tsushima, and shifted our focus to the idea of the Ghost instead. At Sucker Punch we love origin stories, and we wanted to explore what it could mean to have a new hero wearing a Ghost mask, and uncovering a new legend. This led us to Ghost of Yōtei: a new protagonist, a new story to unfold, and a new region of Japan to explore. While we aren’t diving into story specifics yet today, we can reveal that Atsu’s journey takes place in 1603, more than 300 years after the events of Ghost of Tsushima. Our story is set in the lands surrounding Mount Yōtei, a towering peak in the heart of Ezo, an area of Japan known as Hokkaido in present day. In 1603, this area was outside the rule of Japan, and filled with sprawling grasslands, snowy tundras, and unexpected dangers. It’s a far cry from the organized samurai clans who lived in Tsushima, and it’s the setting for an original story we can’t wait to tell."
I'm not sure. They didn't explain her dual weapons in the trailer. I'm most excited about the shamisen she carries on her back though its not pictured here. Maybe it replaces the haikus from the previous game.
Maybe they're symbolic for the warriors she defeated.