As we’re nearing closer to the 2012 edition of the North American International Auto Show [NAIAS], more details are coming out on the new models that will make their debut in the city of Detroit.

Last week, General Motors told us that it is preparing four-world premieres for Detroit including the 2013 Cadillac ATS premium sports sedan, but declined to elaborate on the other vehicles.

However, the Detroit Free Press is reporting today that GM spokeswoman Stephanie Rice said that the other three world premieres will be a “global production Buick crossover” and two never before-seen Chevrolet concepts.

The new global Buick mode is rumored to be named Encore and is believed to be a small crossover based on a similar production model currently being developed by GM’s Opel division in Europe (pictured in the above spy shot).

As always, we’ll keep looking for more information and update this post as soon as we learn more.