First, this is old news. This is a long but really good article detailing the clusterfuck of one of the companies GM was investing in for this 200 mile per charge technology. However, I would not be surprised that they had bets on more just one racehorse, and some of those are still in the game. http://qz.com/158373/envia-t...
Second, the current Tesla doesn't utilize any revolutionary technology. I could strap together thousands of Panasonic lithion-ion lap top batteries in pretty packaging and sell it to you for $70,00o, which is essentially what Tesla is doing.
GM, Tesla, and all automotive OEMs serious about electric vehicles are all looking for the "holy grail" in battery technology. 200 miles per charge is the future, it's just who is going to get there first, and how low the price point can be pushed down.
However, I do agree with Tesla on one point: who in the world needs a generator if you can get 200 miles to a charge?? That's just typical planning for a "1%" use scenario!