If you watched Bethesda's E3 conference, you saw all of Fallout 76 that the publisher was willing to show last week. If you missed the conference and only care about Fallout and don't want to watch an Andrew W.K. mini-concert or talk about The Elder Scrolls Online before getting to what you want, Bethesda has made the Fallout 76 gameplay portion of the conference available online.
You can hear Todd Howard talk about the new online Fallout here. 
Fallout 76 releases on PlayStation 4, Xbox One, and PC.