According to PickupTrucks.com, Dodge is considering one in the future. Supposedly GM has a baby Duramax ready to go, and Ford has the Mexico plant that can pour out the baby powerstrokes.

However I don't see any of them producing them. As was said diesel is too high. Yesterday I paid nearly 40 cents extra a gallon for diesel. A baby diesel with all of it's emission crap would probably cost $5000-6000. Then on top of that we already have an ecoboost putting out 420 ftlbs of torque. How much more do you want from a 1/2 ton?

Unless the diesel could do better on fuel economy loaded and unloaded (and I mean a whole lot better) they wouldn't sell many except to guys that want to mod them