As Bethesda's accidental Xbox release of Fallout 76: Steel Dawn turned into an early release for the expansion, the dev released a trailer summing up the story.
"Steel Dawn is the first chapter in the new Brotherhood of Steel questline, free for Fallout 76 players. Paladin Leila Rahmani and her troops have arrived from California to establish a new Appalachian chapter", the dev wrote.
The trailer packs a distinct neo-cowboy note thanks to the awesomely done rendition of Riders in the Sky, and it looks like it will fit the Fallout 76 bill perfectly.
Fallout 76: Steel Dawn comes with a new questline, where you decide how you'll aid the NPCs in the first chapter of the overarching story arc. Thankfully, the rewards are worth it as the Brotherhood's weapons and armour are the sorts worth having. '
It's pretty obvious from the trailer that Paladin Rahmani, Knight Shin and Scribe Valdez have significantly different approaches to making Appalachia great again, which should provide for an interesting backdrop to the story.
In addition to the Brotherhood's guns and gear, the world of Fallout 76 got a number of new locations populated with members of the Brotherhood, as well as other factions.
It was pretty strange seeing Bethesda's worlds NPCless, seeing as how theirs were among the most memorable ever, so it's nice to see that even Fallout 76 is slowly but surely reverting to the tried and true solutions.
Bethesda also reminded that the Season 3 Scoreboard kicks off on December 15, 2020, where you'll join Time Operative K.D. Inkwell in her quest for the Guild of Antiquities, as well as rank up to unlock new rewards like C.A.M.P. Allies, Lunchboxes, etc.