The UI got an overhaul in many places, including the Workshop, Catalog, and race preparation. Merging spares now asks you to confirm the cost first, and the study dialog shows the mastery you'll gain before you commit.
Several circuits are rebuilt from real reference maps, including Bathurst Mountain, Interlagos Tribute, Nordschleife Tribute, and Belle Isle Street. In Career, Nordschleife is now one lap, and the other permanent circuits keep three. Replays on the old layouts no longer race as ghosts on the new ones.