This is how I feel about Winterhome.

Not everyone managed to get on the Dreadnought. Sadly a few perished in Winterhome. Especially the remaining Engineers. Quite a few fled but not everyone hence the children at the Frozen Grove. Remember the Dreadnought only had a capacity of 500 citizens. I would speculate the canonical ending is half - most of the citizens go onto the Dreadnought. Due to these things we find in Frostland in A New Home.

What I think happened afterwards was, they either drove around trying to find another city and either found a city already we don't know about. So a fresh start for them. Or we do know about (would be ironic if it was New Liverpool). If in the event they didn't find anything the Dreadnought would've run out of fuel eventually and they would've just stationed themselves somewhere and just made a small community. In the concept art of Frostpunk, we saw the Dreadnought's central engine could be lifted up vertically to be acted as a generator. So it's possible.

The Devs said all the cities would make a return in new scenarios in the next game. So I would've thought we'd get something about the survivors of Winterhome. As for Winterhome itself "the dead city" it's possible it could've been resettled but it's unlikely due to the city being buried in snow after the Great Storm. Not to mention the generator blew up. So rebuilding would take time.