Yes.
Okay... Sometimes features like an arm rest can be problematic even if they came from Tesla and aren't as complicated as falcon winged doors. I asked the question because I recall some discussions on here about a rear seat arm rest/storage area/cupholder accessory Tesla sold for the Model S that matched the interior leather and finish of the cars so people could add it to their rear seat area. Think it ran maybe $600 or so. They had problems with the fold down arm rest portion breaking, people reporting even from light use, and they replaced many units only to have the replacements break as well. They ended up discontinuing it. That accessory layed flat on the seat, not suspended like the one in the Model 3 will be (we do have a Model 3 on order BTW so I asked as a future owner). This model is sure to have lots of family use with kids in the back seat who probably will be rougher on the arm rest than adults would be.