The next-gen Impala on Premium Epsilon-II (Cadillac XTS's platform) is due in either 2013 or 2014, I don't remember.
There were rumors that an updated Impala was being prepared for the 2011 model year, but I don't see that happening.
As for the people wanting the G8...why would you rebadge the VE Commodore when the VF is just around the corner?
