You probably can't change seasons whenever you want
So in the latest footage there's a button that says "change season" which has led to some speculations about the player being able to change the season whenever we want to. However, notice that the button is greyed out/dimmed. So apparently you can't change seasons at this moment atleast. Maybe you can only change seasons when certain conditions are met, like a certain amount of time has passed or a certain point in the story progression has been reached.
In this case, it'd be more like a "don't change season yet" function, as the season will only change when you decide to push the button after the conditions are met.
Personally, I'm not too worried about this. It's a fundamental human experience that the seasons do their own thing regardless of what we want. Having less controll about the change of season can make you feel more like a part of nature. The option to stay in the season gives you a chance to finish what you've planned for this season though. That might be a good compromise.