Cadillac XTS Platinum Concept

Do you remember when American car companies made the best sedans? Today GM more or less admitted that, when it comes to full-size sedans that carry a family of five comfortably, their only solution at the moment is to sell you an SUV or crossover. This new XTS concept is the company's attempt to right that wrong.

It's long and sleek, yet quite big inside.

While Cadillac adamantly insists the XTS is a concept car and not necessarily intended for production, it's size and overall style point to what a 2013 model might look like. Industry insiders expect that the XTS will replace both the Cadillac STS (introduced in 2005) and DTS (introduced in 2006).