Fallout 4 - Future Plans

Lostforever pointed us to the Bethesda announcement of the Fallout 4 season pass, which will be available for $30 and the 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.

And:

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.