BMW Shows Off Concept 4 Series Coupe

BMW showed its new Concept 4 Series Coupe to CNBC on Monday at the Detroit Auto Show, saying it has "so much more substance" than its popular 3 Series predecessor.

The new 4 Series will be BMW's improvement to the two-door 3 Series Coupe and other variants in the line, much the same way as the 6 Series relates to the 5 Series.

BMW took the luxury sales crown in the U.S. for the second year in a row in 2012, edging out its German rival Mercedes-Benz.

(Read More: Auto industry posts best U.S. sales year since 2007)

Ludwig Willisch, president and CEO of BMW North America, said he expects the U.S. luxury market to grow in 2013 in its historical 11 percent to 12 percent range.

"[We're] pretty sure the total market for luxury cars will raise again," Willisch said on Squawk Box " in a First on CNBC interview.

—By CNBC's Phil LeBeau; Follow him on Twitter @LeBeauCarNews

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