that's the point, the new contact missions and Issi Classic races weren't in the files for SSASSS dripfeed, well they were, the contact missions at least, I remember Fun finding hints about them, but he never really figured it out, and the races were just made in the creator, they could just as easily add new races and or missions/jobs without us knowing about it beforehand
Actually I didn't find anything that hinted towards the Dispatch missions, I was surprised when they added them.
I've been asking them for like 5 years to add new content like that, they can add anything that involve the creator mode (a job that require a loading screen to play) anytime they want without a new title update.
After-Hours dripfeed is done but there's always the possibility of them adding new races/missions or even mini-heists if that's possible except it will use existing assets so the quality won't be comparable to the Original Heists or Doomsday Heists.
Xbox One X Forza Horizon 4/Forza Motorsport 7 同梱版 (CYV-00062)