I heard this from somewhere as well, looks like it was from the Hitman documentry:
Hitman* Developer IO Interactive reveals Hitman 3 is in the works, at least on paper, *and it may see another episodic release.
As part of video game documentary company Noclip’s most recent project that focuses on the team behind the Hitman games, IO Interactive CEO and co-owner Hakan Abrak mentioned Hitman 3 and its placement in what the team calls a trilogy: “…it’s going to be one game. From Paris in Hitman 1 to the last locations in Hitman 3 . Twenty-plus locations, the ultimate globetrotting experience that we wanted to achieve.”
Just after the confirmation of a third Hitman title, Noclip founder Danny O’Dwyer states Abrak says the game may see an episodic release structure.
I really hope IOI goes back to episodic release, so we don’t get all Challenges, Escalations etc thrown at us all at once.
At least on Playstation you can download all episodes of Hitman 2 separately, so at some point in time Hitman 2 was also meant to be episodic release, but they changed their mind.