https://wccftech.com/forza-horizon-5-hot-wheels-expansion-leaked-by-steam/

Forza Horizon 5 Hot Wheels will be the first expansion coming to Playground Game's open world racing title. The news was leaked a few hours ago by Steam, with Valve's digital store showing Forza Horizon 5 Hot Wheels in the premium add-ons bundle.

The image has since been removed, but you can still find it on Steam's CDN (just like when Call of Duty: Modern Warfare 2 was leaked to be coming to Steam ahead of yesterday's official confirmation).