I've seen half a dozen Fiat Grand Voyagers, several long-travel Rams, and a new Challenger on the road. I've yet to see a turbodiesel half ton Ram on the road. I went to college with a guy that does cals for Chrysler and he has yet to say a peep about interesting engines and/or transmissions ending up in a truck.
I think Ford will beat GM and Chrysler/Ram to the 1/2 ton diesel market, seeing as how they no longer have the Danger Ranger.