GM even stated at the introduction that there would be other variants that used diesel engines and even batteries only. The Volt was only the first in a series of vehicles, which will be coming out in the next few weeks and months. You won't even have to wait until September to see the next variant. There is a video of the interview after the jump, where Lutz also takes on critics who question their intentions to build vehicles based on E-Flex. If you still think GM isn't serious about building alternative drivetrains, you might want to check out their career fair.
[Source: PodTech via Winding Road]