GMC Hummer EV prototypes revealed, debut rescheduled for fall

General Motors is working on a new Hummer, only this time around it will be sold under the GMC brand and feature a battery-electric powertrain. Yes, a name once synonymous with big, gas-guzzling trucks and SUVs is about to go electric. GM originally set May 20 as the date for the reveal of the electric Hummer, which will go by the name GMC Hummer...