Testing in the wintertime? Looks like the testing crew has taken the new plug-in hybrid E-Class up to Sweden to see how the car fares in heavy snowstorms. You can see that there’s a charging port in the rear bumper just like the GLE plug-in hybrid. So what else is going to change? The new plug-in hybrid E-Class will be a bit longer than the one out right now, but Mercedes is also going to extend the wheelbase. Get ready for a lighter and rigid 2016 W213 E-Class.