Even if the technology and production capacity were ready today for a longer range battery, it would seem they already have demand levers in place through the end of 2018 (for the U.S. anyways) - loss of the tax credit - even if only $3750 difference - its still psychological for people not wanting to miss an opportunity for seemingly free money. Plus, still no meaningful competition. Seems more likely that a longer range battery or any other significant features would not happen until January 2019.