It was announced that the Desperate Measures mission, some skins for Adam Jensen's armor and trench coat, new pistol and combat rifle skins, and "various consumables" should now be available when you boot up Mankind Divided on Steam. On Xbox One and PS4 you can pick up this content through each console's digital storefront.
The DLC is titled "Augmented Covert Agent Pack." You can grab it on console via the links below:
Additionally, Square Enix is giving away three digital books, including the novella Deus Ex: Hard Line, a "mini-comic" titled The Dawning Darkness, and an "mini artbook." You can download all three here.