At an event during E3 2017, Techland have announced that Dying Light will be getting ten new pieces of free DLC in the next 12 months. Some will even include extra story content, and the first will be "available soon" adding new enemies to fight against.
To know what to expect, it’s probably worth taking a look at The Following, the Dying Light expansion that came out more than a year ago. In that, Techland shifted the focus from parkour to vehicular action, plonking a dune buggy down in its open-world. Running the undead over proved popular, so it’s likely the developers are looking to expand their roster of vehicles in upcoming DLC.
The Following also added a new cult-addled area to the game, so expect extra segments of map to come out of this plan. You’ll have more info when we do.