The latest leaks about the 2017 Sonic EV indicate that it will replace the Spark EV, not complement it as the gasoline versions do. The Sonic EV will be based on the new platform, which will help it stay competitive with the Leaf. The two big unknowns that I'm most interested are weight and price. The Spark EV is competitive because of its excellent range and its price. These points can't be compromised if the car will ever work nationally. The combination of the low-gear ratio motor and the relatively low weight car help it beat EPA numbers more easily than most EVs. A heavier car will require more gearing and more power to accelerate. This will either require more batteries or less range.
The size increase will broaden its appeal on the national level though. Increased price is only a major resistance factor to growth if customers don't see increased value. The new platform may be high enough quality to deserve a higher price. The Sonic EV will most likely offer multiple battery packs to justify a low entry price and an increased range model, just like the next Nissan Leaf. The low cost one will be the Spark EV spiritual replacement, but I hope it doesn't lose its character.
http://www.greencarreports.com/news/109 ... rickle-out