Sales of luxury cars are growing faster than the overall market here in the U.S. -- and they're positively booming in places like China. Several automakers have already announced big investments in their luxury-car lineups, and now Nissan (NASDAQOTH:NSANY) says it will spruce up its Infiniti brand to join them.

In this video, contributor John Rosevear looks at the state (and importance) of the global luxury-car wars, and at whether Nissan's ambitious plans are likely to turn into big profits.