Well there is twisted metal haha. That's basically just pick your car and go destroy everyone else though (which makes for an awesome game lol).
And I think I do remember reading about your racing idea on whichever thread that was. unless I'm just imagining things.
Not sure if Huxley is going to be that indepth of a game. Meaning they probably won't have highly customizable vehicles to the point where you can add different types of guns or stack on kind of gun or something like that. It would be cool even if they just had a few different types of each main vehicle style. Like the main jeep could either have a gunner on the back or a grenade launcher or a AA missile or something. That would be coolness.
The more customized they can do it, the better imo