Enthusiasts have taken a quick shine to the Tesla Roadster, but the nifty two-seater is not truly a harbinger of things to come from the California electric carmaker.

Tesla's goal is to make more mainstream cars, though it admits that's far from reality. The company's future product plans include two more models that could build volume and expand it beyond its current status as a producer of niche sports cars.

The Model S, an eye-catching sedan, is due in about two and a half years. A third car, which would perhaps be the most affordable, could arrive about five years.