I think they should do a driving story where they re-create back to the future and you are a stunt driver. If you complete the entire mission with three stars in every chapter, you will get the Delorean DMC 12 Back To The Future Edition with all of the time travel things on the back. There could also be a DLC with a small map that can only be accessed when you press a specific set of buttons and proceed to go 88mph in the Back To The Future Delorean.
Hit 88mph and you will travel back to Forza Horizon 4. Hit 88mph again and you go to Forza Horizon 3 and so on… 
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Haha, but seriously that might be a cool feature for some of the missions.
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