I was in St Louis on 3/11 and attended the work truck show, GM had their 2011 Denali 2500 on display. It was very impressive. GM also had a display with the new 2011 frame next to the old frame to show the improvements made along with GM engineers and maintenance engineers available to explain the changes made to the new model. They were also helpful and informative in discussing previous year models, maintenance issues, and generally all questions regarding Duramax engines, Allison transmissions etc.