I emailed the producer awhile back about whether they would make another documentary in the series (Who Killed the Electric Car? in 2006 and Revenge of the Electric Car in 2011) but haven't gotten a response yet. However, I saw an article somewhere that said they were working on another. Unfortunately (at least for me), the article suggested the next installment may be more about car sharing and e-bikes than electric cars, which I think would be far less interesting and could possibly start to marginalize the importance of the electric car revolution that is at such a critical point in history.
It is kind of fun to go back and watch the older documentaries now and see things like the Jalopnik guy saying the Model S is total vaporware.