That would be cool but the car would have to be developed specially for this one event to happen and the car has to meet special requirements. I confess I do not model the cars but I know these few things. I think maybe a booster would be more realistic but still not sure.
Cars can be made especially for that event, as does Roblox for his events.
New year = Santa’s Sleigh (a car)
Easter = and Egg car (lol)
etc.
And maybe when a new car is being added it should be either won in that event or bought later.
I guess the developers could make it happen, but would the cars alternate each year for the people that have already gotten the cars in previous events?