Bethesda has outlined what fans can expect post launch in terms of support, be it mods, DLCs or tegular updates.

Regular Updates

We'll be doing regular free updates to the game, and like Skyrim, these will come with not just fixes, but new features. For Skyrim we added things like mounted combat, legendary mode, kill cams, visual enhancements and more. We’ll work with all of you to figure out what new things you’d love to see added to Fallout 4, whether they are small tweaks or new features.

Mods & Creation Kit

The most important thing in our games is the freedom you have to create your own experience, and modding is a big part of that. Like all our previous games, we’ve made sure to keep Fallout 4 open and moddable at every step in development. Early next year we’ll release for free the new Creation Kit for the PC. This is the same tool we use in the studio. You'll be able to create your own mods and share them with others. We’re especially excited these same mods will then be coming to Xbox One, and then PlayStation 4.

Downloadable Content

We've always done a lot of DLC for our games. We love making them and you always ask us for more. To reward our most loyal fans, this time we’ll be offering a Season Pass that will get you all of the Fallout 4 DLC we ever do for just $30. Since we’re still hard at work on the game, we don’t know what the actual DLC will be yet, but it will start coming early next year. Based on what we did for Oblivion, Fallout 3, and Skyrim, we know that it will be worth at least $40, and if we do more, you'll get it all with the Season Pass.

Key Features:

• Freedom and Liberty!: Do whatever you want in a massive open world with hundreds of locations, characters, and quests. Join multiple factions vying for power or go it alone, the choices are all yours.
• You’re S.P.E.C.I.A.L!: Be whoever you want with the S.P.E.C.I.A.L. character system. From a Power Armored soldier to the charismatic smooth talker, you can choose from hundreds of Perks and develop your own playstyle.
• Super Deluxe Pixels!: An all-new next generation graphics and lighting engine brings to life the world of Fallout like never before. From the blasted forests of the Commonwealth to the ruins of Boston, every location is packed with dynamic detail.
• Violence and V.A.T.S.!: Intense first or third person combat can also be slowed down with the new dynamic Vault-Tec Assisted Targeting System (V.A.T.S) that lets you choose your attacks and enjoy cinematic carnage.
• Collect and Build!: Collect, upgrade, and build thousands of items in the most advanced crafting system ever. Weapons, armor, chemicals, and food are just the beginning - you can even build and manage entire settlements.