https://www.pcgamer.com/upcoming-free-frostpunk-updates-include-endless-and-survival-modes/

Frostpunk's good, ain't it? Chris called it a grim and engrossing city-builder in his review, and I was already engrossed after talking to developer 11 Bit Studios earlier this year. Today, 11 Bit announced a slew of free content which will be added to the frosty society sim throughout the year, starting with a tough new survivor mode arriving next month. Frostpunk is plenty hard already, so I shudder to think what challenges survivor mode's "new, special modifiers" will bring. 

Additionally, another mode called 'endurance' is in the works. 11 Bit describes endurance mode as a direct response to mounting demand for an endless or sandbox mode, but in a Steam blog post, the studio said "it's gonna be our distinctive take on this feature." A new scenario called The Builders, said to be "the most substantial update for 2018," is also on its way, but 11 Bit is keeping details close to its chest for now.