The New Input Package is actually just what Unity users call it because it isn’t the original and requires a package manager install from the stock LTR releases but it’s been out for a few years now. Still, you’re right, although I see no reason not to adopt it, most games that are using it will probably be releasing this year.
I haven’t played Timberborn but I almost did pick it up on the spring sale, decided to get dotAGE instead to see what all the fuss was about and damn I love it. It’s a lot more of a worker placement game and is a roguelike so if that doesn’t interest you it might not be for you but damn it’s good so far.