Quickly engineering a new diesel engine for the Super-duties? I'm not an engineer but how quickly can one design a diesel motor? And it be dependable?

I can see the nice fat rebates Chevy and Dodge are going to come out with now to attract potential Super-Duty consumers.

If I'm going to be buying a 50-60K rig, I don't want to have to wait to see if it is going to be dependable.