This dlc is basically an AU if the lamb gets sacrificed by narinder, meaning that the cult and arenas are abandoned. Meanwhile the only surviving follower in the cult, named Crew, goes on a mission to leave the forgotten cult and start to find a new life outside of the old faith.
Bishops: They are played as bosses (like in the base game) but when defeated, they ask you to spare them, if not they can die, or if yes, they can be your ally (the choice is only be used once). It can affect on what ending you will give
Enemies: basically has the same enemies on each arenas on the base game, but a more higher difficulty, zombie followers would be a new enemy add-on on the cult arena (if you have more enemy ideas let me know!)
Cutscenes: I doubt they have the budget to make more animated cutscenes but if they do, they be on the opening, first encountering the bishops, and the ending
This sounds like a lot for a DLC but if you are interested in this, let me know!