I say the hell with Nissan and hanging on every word or gossip they leak. I have always been an early adopter of technology, including Stereos, CDs, VHS, and computers and have formed the following opinion over the years. DO NOT CARE about small improvements in technology. They are the companies' way of separating you from your wallet!! Over the years, I spent THOUSANDS on the next generation of computers for nothing. The best consumer strategy is to used the crap out of your technology until several generations of improvements have gone by, and you got your value out of the old tech you originally bought. Small appliances may lose their value when new ones come out, but a car that transports you does not devalue at the same rate because it is useful to you every day. The steel, tires, and hardware of the car are always going to be the same, and the body of a car can last multiple decades... That is really what makes a car's value, the body and condition.
SO, my strategy is the following. I own a 2015 that handles all of my driving needs of over 1100 miles /month. I save $$$ in gas that I do not have to buy every mile I drive. I plan to drive it into the ground for 100-120k miles until there are only 5 bars left on the battery. Then, I will put in a new battery and drive it for another 100-120k miles. I have an S version, so I already have $5000 saved over not having bought the SL version! I suggest to all OWNERS of Leafs.. IMHO, Enjoy your marvel of technology as long as you can and don't be a sucker to give Nissan $$ for insignificant incremental changes and optional equipment that really does not change your EV experience.