That wheel might be just a 3D printed part for evaluation and presentation.
Imagine a production part will have air bags, horn, scroll wheels etc integrated.
One of the drivers said that most of the interior items were functional, but they were still working on some of the items, like a g-meter etc.
Believe this new Roadster is going to be a well sorted out street car, with huge capabilities. Imagine it will also do well on some of the track day events springing up all over the world. Take your street car to the track orgainzations are getting pretty popular.
Bet very few cars will be able to hang with this Roadster coming out of a tight corner. Top speeds going down the straight aways will blow everything away as well. Having regenerative braking will take a huge load off the physical brakes, making this thing pretty competitive with other street legal cars.