The update was today and the new free Hot Wheels pack of cars is live! Also a new update for Forza Horizon 4 was pushed to fix the barn find achievement that failed to pop up once all 15 cars had been found. Speaking of barn finds looks like at least 2 more are coming.
The first one i found while driving out of the lake lodge house and the other on my way to the Forzathon live event. Both locations do not show up with the “barn find” tab only on in the map. Looks like we might be getting at least two more barn finds possibly with the map expansion dlcs that are coming soon.