We will not see the 6.7 in a 2500/3500 till March. They will be first be seen at the Washingtion DC Auto Show this week I believe.
"Unveiled last year, the 6.7-liter engine that goes on sale in March will meet new 2007 U.S. Environmental Protection Agency emissions standards and more stringent 2010 standards, the companies said. Cummins makes the engine in Columbus, Ind."
Cummins says its new diesel will be cleanest