In their latest video, Ninja Theory, developers of Hellblade: Senua’s Sacrifice and it's sequel Senua's Saga: Hellblade II, have announced a new game, Project: Mara.
The dev blog itself goes into detail about a new model of development, which Ninja Theory call Dreadnought. This video is actually the first of many diaries the team will leverage to share their progress.
As for Project: Mara, not much is known at this point apart from a short teaser. They claim that the game will be a, “grounded representation of true mental terror,” and will be, “based heavily on research, interviews, and first-hand accounts to recreate the horrors of the mind.” Check it out below.