I think Buick is planning on moving away from the retirement set..
I am not sure how good an idea that is. GM did the same thing with Oldsmobile and ending up losing what was at one time their most profitable brand. Selling a good, near luxury car in the $30,000 range would be a good move for this car but it is not, in my opinion, going to play in the $40,000 range that Lexus and Infinity play in.
I also highly doubt GM is going to take much away from Lexus and Infiniti. It is a different demographic. These brands, especially Lexus, have cachet and Buick doesn't.
A little anecdote about demographics: When I worked at GM, 99% of our customers were Caucasian. Very few had post secondary education, many smoked and more than 50% did not use the internet. Many, many were on their last vehicle.
Compare that to the demographic of the city of Vancouver. Over 50% Asian, over 60% post secondary degree, average family income over $80,000. Fifteen percent are over $100,000. People here do not drive Buicks and they are not going to, either.