Expected to be launched as a 2012 model, the Cadillac ATS will likely be previewed by a concept at the Los Angeles Auto Show.

According to a recent report, the Cadillac ATS will be available as a sedan, wagon, coupe, and convertible.

While details are limited, Inside Line is reporting a sourced has stated "We're finalizing the four-door showcar of the ATS first. Then we'll follow quickly after with a wagon, a coupe and a convertible." The concept (aka showcar) will likely be shown at an auto show later this year, possibly in Los Angeles.

Perhaps the most interesting detail is the report of an ATS convertible. It seems that Cadillac hasn't determined whether to use a conventional canvas roof or a folding metal unit. As the source said, Cadillac is "not too sure about the compromises of a folding hardtop."

Expected to be launched as a 2012 model, the ATS will replace the Saab-based BLS. It will target the BMW 3-Series, the Mercedes C-Class, and the Audi A4/A5.

Gallery: Cadillac ATS Development Continues - Sedan, Coupe, Wagon and Convertible