In a recent interview, Embark Studios' Head of Design, Virgil Watkins, shared information about the long-term plans for ARC Raiders.
We have been internally calling ARC Raiders a '10-year game' for a long time. This is our goal, which determines the type and amount of content planned for it.
The designer did not go into details about the specific content or timing to avoid "promises that may remain unfulfilled", but it can be assumed that we are talking about new enemies, equipment, storylines, and events.