In Overwatch, the essential part of Lucio's character is that his music has literal healing properties, and the news story mostly provides a story explanation for them. You can get a better look at Overwatch's 29th character in action, below.
The short introduced us to some seriously cool new characters like Elizabeth Caledonia Ashe, the white-haired spitfire who leads the Deadlock Gang and has some major history with McCree; Bob, the mustachioed Omnic mech; and Echo, a mysterious white robot that used to fight alongside McCree and the other members of Overwatch.
The Overwatch Twitter tweeted the short alongside the message: "An explosive train robbery gives McCree the chance to settle some unfinished business with a few former associates". She founded the Deadlock Gang and sought out to make their name widely known in the American Southwest. More to come on her, as Blizzard sends the information over. More information about the new hero will be available at the Overwatch: What's Next panel happening today.
Ashe comes with a skill set that relies on a player's mechanical skills to some extent; her weapon, Viper, is a semi-automatic rifle that fires quick shots and needs to be reloaded one bullet at a time. In addition to her main firearm, Ashe also has access to a stick of dynamite and a small shotgun that can cause massive pushback to both herself and her enemies. Finally, her ultimate, Bob, summons her hulking mechanical sidekick "who charges forward and knocks enemies into the air, then lays down suppressing fire with his arm cannons".