I have a few things they mentioned along with some images. They aren't the best but its what I could grab. If someone would like to use this info to have a complete list of what was talked about for FO76 and make their own post, feel free to use the info mentioned here.

Quakecon 2019 Fallout 76 Panel
Vault Raids and discussed
Cases are coming August 20th along with first Vault Raid.
Cult of the Mothman faction announced.
Concept art for new clothes.
Reputation system for factions. Announced.
Romance Companions
New Weapons will be released
Looking at ways to increase camp budget.
Mentioned private servers. will be coming soon.
Working on Seasonal events: halloween & winter
Changes to Events. Fast travel to events for free. how much more time events have.
Legendary Perk system: a work in process and concept, but after level 50 for every 50 levels you can choose a special you can be legendary in. retroactive if you are say level 300. If you start a new character you can use those legendary perk cards. (this might change over time.)
NW: tickets to redeem to purchase perks if you get a duplicate perk card.
NW: weapon balancing or general balancing
Wastelanders update: Tentative release date is November. If you don't know what tentative means get a dictonary.
Wastelanders: Balance pass on FO76

Want to send feedback Bethesda will see?

Again mentioned here at QuakeCon 2019 post on Reddit or Bethesda Forums.

RoadMap

Weapon Concept Art

Clothing Concept Art

Roadmap 2019 (Goal to make FO76 a full fledged RPG.)

[2019] Anyone posting a QuakeCon 2019 rundown?