A photo posted by an Australian car import company, Cult and Classic, may have revealed the location of Forza Horizon 6. The post showed a developer taking photos with a kei-model car, which is typically found in Japan. Kei cars are not sold in the US, prompting speculation that the next Forza game will be set in Japan.
Source: https://www.ign.com/videos/forza-horizon-6-location-may-have-been-leaked-by-car-import-company-ign-daily-fix