The looks are all about brand recognition...expect to see a similar treatment given to Cadillac, too...
You ever notice how no A-to-B drivers really refers to their BMW as "3 series, or 5 series, etc"? They just have a "BMW". That's hopefully what will happen with Buick and Cadillac eventually. The cars will all be similar enough in exterior styling that people can say they own a "Buick" with pride. But there will be a size of Buick for everyone.
