Yep. G6 is Grand Am replacement.
http://www.edmunds.com/new/200...ubnavheader..2.Pontiac*
Originally introduced in coupe form in 1973, the Grand Am has carried out Pontiac's midsize sedan duties since the mid-1980s. The most recent Grand Am has roots dating back to 1985, when Pontiac introduced its front-drive "European-inspired" version. Time has not been kind to the Grand Am, as subsequent redesigns in the 1990s did little to bring the car up to class standards. Pontiac knew it needed a competitive replacement, and none too soon. The short answer was to simply make a great Pontiac sedan based on GM's latest-and-greatest midsize platform, the Epsilon architecture. It's taken awhile, but it looks like GM has finally gotten this platform-sharing thing down. We've never been opposed to the idea per se, but in too many instances in the past, cars that shared platforms were just too similar for our tastes. The G6 is the third production car to utilize General Motors' Epsilon platform but it wouldn't be overstating it to say most new car buyers will never see the family resemblance. If it seems like the G6 looks a little bigger than its stablemate, the Chevrolet Malibu, that's because the Pontiac uses the lengthened version of the Epsilon platform like the Malibu Maxx. This long-wheelbase platform provides two main benefits -- more rear-seat room and better handling. The extra length makes for truly big-car backseat space, and passengers will enjoy plenty of legroom