Was just reading the November issue of Motor Trend and they stated the new 2010 2500HD & 3500HD models receive USB connectivity in the center console, enabling audiophiles playing through the system, and battery charging for some handheld devices.

I wonder if it is possible to reverse engineer it to 2009 and older trucks...

sure, its very easy to retrofit it into any 2007-2009 dmax...you just need to replace the radio and add the wiring/USB plug.