Fallout 4's DLC season pass — for Xbox One only — is discounted to $29.99 right now, a day before its first expansion, Automatron, is due to launch. Ordinarily the season pass is $49.99
Automatron, which involves building and customizing robots as well as a mission to confront and defeat an evil robot maker, arrives tomorrow. It is $9.99 for those who don't want or don't have the season pass.
Automatron will be followed by Wasteland Workshop in April, which is a $4.99 add-on that lets players capture enemies, tame them as companions or pit them in fights to the death. That will be followed by the full story expansion Far Harbor for $24.99.
Sometime after that, the Creation Kit, an official mod support toolkit, will launch. It will come first to PC, then to Xbox One and finally to PlayStation 4.