With the press days over at the Tokyo Motor Show, automakers are now turning their focus on the next big automotive event, which is the 2012 North International Auto Show that takes place in Detroit from January 10 to 23.

Today, we learned that General Motors is planning four world premieres but for now, the company will only tell us about one of the vehicles it will bring to Detroit, the 2013 Cadillac ATS, which is aimed squarely at the entry-level premium sedan segment rivaling the likes of the new BMW 3-Series and the Lexus IS.

“ATS is a crucial part of Cadillac’s expansion,” GM Senior Vice President of Global Product Development Mary Barra told the Automotive Press Association on Friday. “ATS enters the biggest market segment in the global luxury car industry, both in terms of volume and importance.”

“It’s a segment dominated by German cars, including the BMW 3-series, Mercedes C-Class and Audi A4, so we’ve developed a compelling and convincing new challenger,” she added.

As for the other models GM will show in Detroit, the company said that they include both concept and production vehicles, but we’re pretty sure that we’ll learn more about them before the end of the month.