Well , a short list of important changes .
Prices have gone up (one time in Car Classes patch last year and one time last week or so) .
Tiers no longer exist , now cars are divided in classes .
All tracks are no longer available , now there is a weekly rotation of 20 ~ tracks .
Some cars are made IGC while others are retired and will be SB only . There are more IGC cars now than before .
MP is "untraceable" because of people using "lobby crash hack" .
Drag is here and extremely boring .
The game is more pay2win than ever before .
Drop rate is very low , a part/week from TH , and even worse from events .
Achievements are fun to complete and give some really nice rewards but you will complete most of them at some point .
Except achievements the game is really boring , once I reached 5000 DS I've found no reason to play it anymore , just doing TH .