Much like Forza Horizon 3’s Hot Wheels DLC, Forza Horizon 4 is once again returning to the world of toys with its LEGO Speed Champions DLC, with cars and environments built from the ground up using everyone’s favorite plastic bricks.
Source: N4G PC E3 2019: Joyful Destruction in Forza Horizon 4's LEGO Speed Champions – Hardcore Gamer