A Season Pass is currently available for purchase for Deus Ex: Mankind Divided. For those wondering what sort of content you can expect from the Pass, wonder no more. The big items seem to be two new pieces of story related DLC.
Story missions

Deus Ex: Mankind Divided is slated to be released tonight at midnight, so long as you aren't getting the digital PC version through Steam. It seems as though that version will unlock tomorrow afternoon.

The Season Pass is going for $29.99 (USD) and can be picked up through Steam or other digital retail outlets for your platform of choice.