https://wccftech.com/fallout-76-beta-revenge-system/

Before release, all those who pre-order Fallout 76 will be able to get a taste of the game on all platforms with the beta. A precise launch date for the beta hasn’t been confirmed, but it won’t most likely be in July.

Speaking in an interview with FZ.se, Bethesda’s Pete Hines revealed that the team is going to be playing the game internally for the next month, so it’s likely that it won’t be made available in July.