It took a good bit of searching, but I finally found a picture of the larger badge on the net.

Go to the Grand Prix section of pontiac.com, pull down About Grand Prix and select Photo Gallery, click to enter the Exclusive - Winner's Report, then See It Now on the right hand side by A Winner Hits The Street, after it loads click on Photo Gallery, after it loads click Rear View - and THERE is the larger Comp G badge on the left side!! :p

I notice that even the main page of the Grand Prix website has a picture of right side and the back, exactly like the one in the brochure I have (picked up late February) EXCEPT it now has the smaller Comp G badge on the right side of the trunk. Maybe the larger badge (which I think is way cooler) was eliminated in final production tweaks.