When designing additional content for Fallout 4, Bethesda seems to have a lot more creativity in mind to allow us more freedom in the wasteland. Rather than just building new stories, they have been creating new ways for players to interact with the world using Fallout 4's settlement building feature. And in the next batch of additional content, things get a lot more interesting.
The next batch of additional content to come to Fallout 4 is the Vault-Tec Workshop, which will allow players to build their own vault, you will be able to furnish the vault and even attract settlers, think of a fun version of Fallout Shelter. You will even be able to train your settlers to defend your vault, and if I am correct, you can even perform experiments like Vault-Tec has done in each of their vaults, certainly this is content worth playing.
Vault-Tec Workshop was announced back at E3 and Bethesda finally announced a release date for the content via their official website, with the content officially releasing on the Playstation 4, Xbox One, and PC on July 26th.