JoshProd created a Facebook page for the game, I assume further announcements regarding the game will be posted there: https://www.facebook.com/arcaderacinglegends
I assume the cars in the page header are the cars they want to put in the game.
Regarding the demo, it's hard to say at this point how the game will turn out. I assume the tracks are only placeholders from the mobile game. At least I hope so, because to be honest, those tracks seem very bland and unmemorable for me.
The physics is kinda weird. Very grippy, no sliding/drifting going on. When it comes to collision with other cars, it reminds me a lot of V-Rally 2: seems like you're doing fine, then boom, they spin you out in a nanosecond without you ever feeling it was coming.
About the Kickstarter, according to them it was supposed to start on the 21st, then on the 24th, now they're saying this week. There might be very reasonable and legit reasons for delaying it, but it just makes me even more skeptical about the whole thing. They also claimed they want to release the game at the end of 2019, but given it's almost July already, I just don't see that happening.