Yes. For the Chevy Camaro and larger RWD Impala Yes and possibly AWD. Chevy sedan yes, in length and width and interior room. The Camaro will be wider but may not be for sure longer. See the concept and add a few inches for the Camaro. The Pontiac's and Buicks will likely be , in relatively low volume numbers, Holdens and so VE's till about 2011 or 2012. Buick will get the WM Statesman, Lutz has pretty much confirmed this in his leaks. Pontiac will likely get a Commedore with a new front and rear facia. I don't expect much to be different, though it was said that the GTO's design work was finished quite early on. I don't expect it would be very difficult to pull any changes from the finished GTO over onto the G8 (or whatever it gets called). That being said I don't think the next GTO will be a VE. It could be or it could be on GMNA's Zeta program. Both would arrive at about the same time.My reasoning about this is that VE just came online, the plant has been updated and people were laid off when the GTO went away. The plant does not run a 3rd shift at the moment. VE was expensive $1 Billion! It needs to be paid off from the Holden plant because the GMNA RWD chassis is not the same thing. They will share suspension components powertrain and other components but the unibody is new for the GMNA RWD cars.
Also consider the plant that we KNOW will be making RWD cars in GMNA, Oshawa. We know the Impala was redone in 06. The RWD replacement will come online in 2009 or 2010 or so MY. The GP and Lacrosse are both getting re-skinned, and will share engines with the Impala (though the Lacrosse could keep the 3.6 HF). The reskinned GP and LAX are due around 08. So I expect, like the Impala, that they will be around 3 years and that puts it at 2011 or 2012.