Alright, some general notes, tracks are missing props, mainly foliage, lampposts and billboards. This affects all tracks. (England, Serpentine, Mud, SF Marina to name a few)
With that out of the way, here's what I got out of testing them all:
- Most of the tracks are visually upgraded. Keep in mind, most updates come in the form of new layouts.
- England Summer textures are working.
- Tokyo Night lampposts don't emit light onto the cars. Looks like they never bothered fixing it, or something's missing.
That's all I have to report on my side.
Here's some before and after comparisons.
Circuit:
Before
After
What changed is that they got rid of some ingame sponsors in exchange of ads for their games, so maybe you should seek for the original textures for them.
Cali Raceway:
Before
After:
More/Different billboards all around the track it seems.