Personally I am quite excited for it. I’ve been getting back into the game recently as a friend of mine got it for his PC and it’s one of the few games we both have that offer PC / Xbox crossplay.
I don’t really have much affinity for Hot Wheels themselves (Saying that, the new Hot Wheels game that came out a month or two ago looks quite fun), but the DLC looks a bit like playing Trackmania, which I was a huge fan of growing up.
I know it had a similar DLC on Horizon 3, but I didn’t have that game, but I heard good things about that one, so hopefully it lives up to that one.