It seems that the recent video about accessibility options for blind gamers revealed another #NewToForza car to be included in the game… although let’s mark it just as “spotted” instead of “confirmed” for now 
It’s probably 2014 Ford #17 Focus BTCC (thanks, @SechsComic73130).
I hope it means that T10 has no licensing issues with BTCC (despite Motorsport Games exploiting rights to this series at the moment) and we can expect more cars like this in the game 