Bethesda revealed a number of new Fallout 4 DLC packs coming later this year, but the most interesting one has to be the "Vault-Tec" expansion, which will let all of us become the most evil vault overseer ever.
Here's a trailer. Note that they straight up say that you can experiment on dwellers -- I can't wait to see what ridiculous things people come up with.
Also unveiled today: a new "Contraptions" workshop DLC, which lets you build all sorts of new doo-dads, as well as a "Nuka World" DLC, which allows you to build a post-apocalyptic theme park. Both are featured in the trailer above.
So...what type of vault will you be building?