They confirmed back in November that they had already started work on Part 2, though no real details. Assuming they use the same engine and assuming they toss the world map idea, I can see Part 2 coming out in 2022 optimistically, and 2023 realistically. I feel the biggest hurdle will be the transition to the next console generation, so I can see them delaying the PS4 version so they can finish the PS5 one (more realistically, they would make Part 2 for the PS5 and simply scale it down for PS4) and have them release at the same time.