Looks interesting. I also like sim games to be focused on building and without disasters or combat, although if disasters can be managed that could be ok.
Their website says that they are two developers who started in early 2021. They seem quite good to have that much done already if they aren't faking (and it sounds like they are both longtime game devs so it makes sense that they make good progress) but still there are a lot of things that can go wrong in sim games. So hopefully "soon" won't be all that soon or at least will be early access for a while. I've been eagerly awaiting Indoorlands for quite a while now so the announcement doesn't necessarily mean it won't still be a few years.
Timberborn has been in progress much longer and currently has more developers and still has some stuff that could be improved, although I'm not sure about their relative experience. Still a really nice game and one of my all time favorite sim games already (along with the RCT games and Sim City 3000). I also tried
Urbek recently as well that was in development longer, although I'm not sure how many developers or their experience. I'm not as fond of the puzzle thing but it is still a nice game that I recommend for sim game fans (even though the growth mechanics are different it has a better "old sim city feel", partly due to the music and sound effects, than any other sim game I've played). It also feels like some additional work would provide a much nicer experience. Of course, it is hard for indie developers to get the funds to make most stuff work well unless it gets very popular in early access like Timberborn has (and there is always something that could be improved or seem to be improved; I think Stardew Valley might be a case where I liked the earlier versions better, although I'm sure the multiplayer stuff is great for anyone who wants that).
There are several others as well; it is wonderful to see so many nice indie sim games here lately (and the non-indie Two Point Hospital should it ever actually arrive :) ).