GM might as well have the gas engine charge the batteries if they're gonna put an ICE in there. It's a convenient thing when you can't plug it in, ya know?
Tesla? Gonna wait for the POrsche 918 hybrid! Funny how it defeats the purpose of saving money by paying for less fuel when the cost of the 918 is so ridicously high that it'll take forever to recooperate the cost of the car through gas savings

Then again, I guess some people can say it's to leave a smaller carbon footprint.