As revealed in a YouTube documentary by IO Interactive employees, a third Hitman game is already in the works. Hitman 2 gets a new DLC today, namely Siberia (The Prison), and Hitman 3 could bring back the episodic structure that was present in the first Hitman title, which was released back in 2016.
https://www.notebookcheck.net/Hitman-3-is-in-development-already-Hitman-2-gets-a-new-map.428387.0.html