I got the Switch working again and can give first impressions of the game now. WRC 9 is obviously going to be a lot like 8, but there are minor differences. Citroen is no longer in the top division and the loading icon is a steering wheel now. I still would want better leaf definition when it comes to graphics, but all in all I'm happy with graphics. A new addition to the game is the WRC 3 class of rally car. I'm still in Junior WRC so I'll have to tell you what WRC 3 class is like when I get there.
9 is also easier than 8, you're not doomed just because you're playing on Expert difficulty. If you do play on Expert you probably want to be experienced with racing games, but that goes without saying. I love the game so far.