The game will come out on 19 May 2025.
The full version will let you play an infinite career (as long as you do not run out of money), save your game in between races and mod pretty much everything except for the core simulation engine.
A modding guide will ship with the game and you can also access it here:
https://steamcommunity.com/sharedfiles/filedetails/?id=3476399454
See you then!