During Buick’s Los Angeles Auto Show press conference for the unveiling of the Opel Insignia-based 2011 Regal saloon, the company’s product marketing director, Craig Bierly, showed a teaser sketch of the next addition to the Buick range, a premium compact sedan.

“And now, I have more exciting news to share with you; the first public showing of a rendering that includes our entire future sedan portfolio,” Bierly said at the presentation.

“In addition to the new Regal, which you see on your right, you see our LaCrosse in the center and at the far left, an all-new premium compact sedan with the styling and craftsmanship of Enclave and LaCrosse plus the European-inspired driving dynamics of the Regal – and at a price that will make this Buick our new entry point to the brand.

“Is Buick’s transformation complete? No … but we believe we’re making steady progress,” Bierly added.

While Bierly did not give out any specific details on the car, it’s safe to assume that, like the Chinese market 2011 Buick Excelle hatchback, the four-door saloon will also be based on the new Opel Astra (sedan version), which shares the same Delta II platform with the new Chevrolet Cruze.

Our spies have already captured Buick’s compact sedan testing in Germany, though at the time, it wasn’t clear if GM was developing the car exclusively for China or also for the North American market.

In the States, the new Buick compact sedan will most likely be offered with a similar engine range to the Cruze including a 1.4-liter turbocharged four-pot, and quite possibly, the Astra’s more powerful 1.6-liter turbo unit with 180 ponies.