G nailed it. The dark grey handles did first appear on the Performer's in 2010 and then the 26"er kettles in 2011, then the regular kettles and the rest of the Weber charcoal family got the dark grey handles for late '11-early '12. Probably to be consistant since there were 2 and then 3 different handle styles for different models. As the plastic handles go, the new style dark ones are growing on me. I wasn't a fan of the 2000-11 handles. But at the end of the day nothing beats wood handles!
Strangely enough, the full size chimney's still have the basic flat top white-grey handles.