It’s through a small video that Blizzard Entertainment introduces you to Sojourn.

The latter is an old captain of the Overwatch and is equipped with cyber increases.
She also counts on her railgun to help him defend himself.
She fought alongside Jack Morrison, or if you prefer the soldier 76, during the Omnic War.
Subsequently, it joined the Overwatch to protect the heroes.
You can play this new character at the launch of Overwatch 2 closed beta scheduled for April 26th.

Overwatch 2 New Hero Sojourn Revealed! | BlizzCon Highlights
This beta will be an opportunity for players to try the “Push” mode and also discover new cards, as well as the new versions of these heroes: Doomfist, Sombra, Orisa and Bastion.