The 2015 Alfa Romeo 4C sports car is the first of several Alfas headed for U.S. shores. The 4C will arrive at a few select U.S. Fiat dealers by the end of June. Photo credit: Fiat Chrysler Automobiles.

It's one of the biggest trends in the auto business: Around the world, luxury-vehicle sales are booming.

Nearly every global automaker is investing big in luxury models, and Fiat Chrysler Automobiles (OTC:FIATY) is no exception. The Italian-American automaker owns several intriguing luxury brands, including Ferrari, Maserati -- and Alfa Romeo.

FCA's challenge is to turn that little grab bag of brands into a cohesive model lineup that can challenge the German luxury behemoths. At the lower end of the market, that job will fall to Alfa Romeo. Alfa will make its long-awaited return to the U.S. market this spring, with a hot sports car called the 4C -- a model that will be followed by a slew of new Alfas over the next few years.

If FCA's emerging plan works out -- and if the new vehicles are strong contenders -- this plan could lead to a significant boost in FCA's profits over time. In this video, Fool contributor John Rosevear looks at what is known about FCA's plan for luxury-car domination and what U.S. Italian-car fans can expect to see over the next few years.