In what Playground state is the largest expansion they’ve ever made, the first DLC for Forza Horizon 4 will take you to Fortune Island. It’s a glorious looking location, with lightning strikes and the aurora borealis featured really taking the weather in the game to the next level, and also featuring the longest paved road of switchbacks in the game. Surprisingly, it’s coming out this year!
Additionally, there’s ten new vehicles coming to the game, based off Ken Block’s greatest Gymkhana hits.
Source : http://www.thesixthaxis.com/2018/11/10/forza-horizon-4s-first-expansion-heads-to-fortune-island-later-this-year/