Dying Light 2 Stay Human will be releasing early next year, and it seems that developer Techland already has some plans for the game’s post-launch support- or an inkling of plans in this specific area, at least.
But at some point I think we will support something that you have just mentioned.”
During an interview with PC Gamer, lead designer Tymon Smektała hinted that they might work on adding character classes in the future that could be geared more towards co-op play.
The first Dying Light, for instance, has received a ton of expansions and DLCs, and if such a treatment is given to the sequel as well, such a feature might be added further down the line.