There hasn’t been a lot of information released on the specifics of what we can find in the new season of Fortnite, but Epic Games did give some clues on where to find the cars.
“As time goes on and water recedes, even more locations will be uncovered,” Epic Games said. “And as the roadways become more open, you’ll discover new ways to get around.” This was written along with a still shot of a really fun blue race car looking vehicle.
We can then assume that the water in Season 3 will disappear at some point, allowing drivers to see what was under all that and, hopefully, to find some cool looking cars along the roads to drive. With the addition of cars, players will be able to drive around with those, boats, helicopters, and of course, golf carts.