https://wccftech.com/forza-horizon-3-xbox-one-x-update/

The highly anticipated Forza Horizon 3 Xbox One X update is currently being rolled out as we speak.

The game already showed up as being ‘Xbox One X Enhanced’ for numerous gamers, but the update is now finally being deployed to Xbox One X systems. The exact Xbox One X enhancements are unknown, but Microsoft and Playground Games have promised native 4K resolution on the One X.