Mercedes to release 10 new plug-in hybrids by 2017

Luxury auto maker Mercedes-Benz has just announced that it will be greatly expanding its lineup of plug-in hybrid models by launching 10 new vehicles between now and 2017. As of now only two models are confirmed for sale in the U.S., but with an aggressive worldwide release of 10 hybrids, it means Mercedes will average a new model every four …