"We probably gave an expectation of availability which in hindsight was too early. Our engineers are incredibly crucial and they want to make sure that every [Leaf] coming out of the gate is absolutely right. The rate of climb has been probably a little slower than you’d expect.
They were just taking their time in Japan to make sure everything was perfect. We’re at the leading edge of technology and the engineers just wanted to make sure that the car was absolutely spot on."
Em: http://thatsbadass.com/tag/leaf/