The creators of Atomic Heart continue to tease the fourth addition to Atomic Heart. Its name has not yet been revealed, but they have shared a little about the plot of the DLC:
Hand in hand, amidst the grinding of metal, the Nechaevs enter the final confrontation with HRAS, who unleashes all the robotic power of Enterprise 3826 upon them.
This DLC No. 4 for Atomic Heart will be the last DLC and will conclude the story of the first part. The release date has not yet been announced.