Possible hint at the first expansion?

[MilkandMelk]

"Race new terrains"
Hmmm? Could that be dirt or gravel? Also, the background does look suspiciously like a dirt road. But it does list two cars that

Image credits go to Jack Broseff on Carthrottle. You should check him out, he races go karts!

 

[Nacho Libre]

The track(s) may be unrelated to the cars in question since all we already have quite our share of rally cars, SUVs and trucks!

 

[PJTierney]

http://www.kudosprime.com/f7/car_sheet.php?id=699

http://www.kudosprime.com/f7/car_sheet.php?id=2

The cars mentioned are already in the game.

Treat this image with suspicion.

 

[TheAdmiester]

http://www.kudosprime.com/f7/car_sheet.php?id=699

http://www.kudosprime.com/f7/car_sheet.php?id=2

The cars mentioned are already in the game.

Treat this image with extreme suspicion.

I get the impression that this isn't a DLC description but rather one of those ads like "drive the open roads of Australia in Horizon 3", meaning it's listing cars from the base game and not a car pack.