No doubt, GM will eventually end production of the Lucerne and finally phase out its quickly aging platform. However, GM has not made any comments on the future of the Lucerne. The only work done to the Lucerne lately was face life for 2010. The entire lineup recieved the Super's lower front fascia. But that could very well be the last update for the stale car.
Motor Trend has commented GM plans on phasing out the Lucerne in 2010, however, an all new model will then debut for 2012 model year, after a one year absence. Rumor has it that GM will move the sedan to the upcoming "Super Epsilon" platform to further distance itself from the large Lacrosse and move the car into the $30,000 range. The current model starts in the high 20's, just a few thousands more than the Lacrosse. So no doubt a new model will move more upscale no matter what. The question is, will GM keep the Lucerne name? Probably not. Most feel GM will revive the Park Avenue name for the U.S. lineup, but that could affect Buick's dream of scoring a younger customer base.
With 2010 around the corner, expect to hear at least something on the future of Buick's full size soon.