Update, 3/22/16, 7:35am PT: Fallout 4 Automatron is available now. Bethseda also announced that more DLC packs are forthcoming: In April, we'll see "Wasteland Workshop," an expansion of settlement capabilities, and May will bring about "Far Harbor," which the company said is the "largest landmass Bethseda Game Studios has ever created for post-release content." More DLC is coming throughout the year, including Survival Mode and the Creation Kit. The latter will let you share mods you built on the PC with consoles.
Bethesda will release the first add-on for Fallout 4 on March 22, bringing new quests, enemies and companions to the Commonwealth Wasteland.
The antagonist of the Automatron DLC is named the Mechanist. Fans of Fallout 3 likely recall a different character by the same name that used an army of robots to fight the Ant Queen. Although these characters look somewhat similar, and both pull from the fictional in-game world of the Silver Shroud, the Fallout 3 and Fallout 4 Mechanists are entirely different people.
In Fallout 3, the Mechanist tried to take on the role of a hero defending a town, but he ultimately was causing more harm with his dangerous robots. It isn’t clear what the Mechanist in Fallout 4 plans to do, but judging by a video trailer of the DLC, it looks to be along the lines of conquering the Commonwealth Wasteland.
Besides the new quest line and the assortment of new items that are added with every DLC, there is one particularly exciting new feature added to the game: the ability to build robot companions. These new robot companions are completely customizable and can be built with parts scavenged throughout the wasteland. Their voices and color schemes are also customizable.
The new DLC is priced at $9.99 if you didn’t already purchase the Fallout 4: Season Pass that included all of the DLC. You can still find the Season Pass on some sites for $29.99, but Bethesda officially raised the price to $49.99 earlier this month. The company has two additional DLC packs, the $4.99 Wasteland Workshop and the $24.99 Far Harbor, that will be released in April and May of this year, respectively.
Until those additional DLC packs are released, have fun building robot minions to kill raiders for you.
Update, 3/14/16, 1:00pm PT: Corrected release date.