https://www.gamespot.com/articles/e3-2018-fallout-76-beta-only-available-to-players-/1100-6459821/

We're getting tons of new details about Fallout 76, which will be a multiplayer open-world game with survival elements. Since the PS4, Xbox One, and PC game is shifting to this new focus, it will have a beta testing period, and there's only one way to get in: by pre-ordering.

According to an FAQ posted on the Fallout 76 website, anyone who pre-orders the game for all of the platforms available will automatically receive beta access when it launches. Bethesda didn't say when that beta period will start, but the game will release on November 14, so it won't be too long. You'll need a free Bethesda.net account, and once you have that you'll be able to enter the redemption code on the pre-order receipt from the retailer you chose to confirm your interest. For more details, check out our Fallout 76 pre-order guide.