When the post-holiday icicles return to our hearts in January, we’re gonna need something to thaw ’em out. Perhaps the official unveiling of the BMW 4 Series Concept Coupe at the Detroit Auto Show will do the trick? It’s a slightly longer and wider ride than the 3 Series, which just gave the designers more room for super sleek lines. There’s full-LED headlamps and an interior that’s overflowing with more premium leather than a Coach outlet shop (don’t ask how I know that). Stay tuned for more details on what’s under the hood, but we’re expecting something close to the 3 Series’ 2.0-liter turbocharged inline-four cylinder engine and the 3.0-liter turbo-six.