I can tell you one thing it's not. I still won't recognize my wheel. I still have to do the unplug thing to get it to work. I was really hoping as big as the update was that the wheel fix would be in it.
It’s just the hotfix us PS4 users got a couple of weeks ago. Reason it’s so big is I understand you just re-download the whole/large portion of the game to update. So don’t worry, none of us noticed any differences, apart from the livery editor working. (Apparently. I’ve never actually used it).