Square Enix and Microsoft have a special promotion because the Regalia car from Final Fantasy XV will soon be playable for you to race in Forza Horizon 3.
Starting on August 1st, players of both Forza Horizon 3 and Final Fantasy XV will be able to download the Regalia for free. No money is required for you to download this DLC!
If you played Horizon 3 on Xbox One, Xbox One S or Windows 10 PC, a code will be sent to you via the in-game messaging system. If you played Final Fantasy XV on Xbox One or Xbox One S, a code will be given to you via the Xbox Live messaging system.
Obviously, only the first version of the Regalia is available to drive in the game. You cannot make it fly like how it does when you finish Final Fantasy XV.