Bethesda also reveals how much space you'll need on consoles, and when the game unlocks.
Bethesda hasn't announced what the content is, but you can now preorder it.
Pete Hines, from developer Bethesda, discusses the company's content release plans for the open-world role-playing game.
Take an in-depth look at the rather large Perk Tree.
Plus, hear the full orchestral version included in the game.
Creation tool coming to PC in the first months of 2016, but the timetable is "fuzzy."
"It is the unfortunate truth that when you go above ground, you will be faced with many post-nuclear nuisances."
Id Software assisted Bethesda on firearms combat.
"Do you know what makes you S.P.E.C.I.A.L.?"
"We don't know what the actual DLC will be yet, but it will start coming early next year."